Replacing the SUMP ASSY (AJH31248604) and protecting/repairing (as needed) the Wire Loom inside the door assembly---will resolve your immediate problem ("LE" error).
The "LE" error is *extremely* common for all LG dishwashers built from 2004 through mid-2008.
The cause of the Wash Motor failure is due a process during manufacturing---that degraded/damaged the Wash Motor.
Replacing the entire Sump Assy makes perfect sense in this case (as opposed to just the Wash Motor) since the new design Sump Assy has a much better design internal gasket.
The original Sump Assy gaskets were extremely challenging to re-install (disassembly is required to replace the Wash Motor).
Replacing the Sump Assy---also has the benefit of having a new...
1) Wash Motor
2) Heating Element and internal Thermistor
3) Drain Motor
4) Soil Level Sensor
5) Vario Motor (switches water from lower washer arm-to-middle and upper wash arms---every 90 seconds)
After removing the door panel----inspect the Wire Loom from the bottom of the door-up-to-the-Detergent-Dispenser-Assy.
Repair wiring as needed.
Wrap the entire Wire Harness with electrical tape---from the bottom of the door up to the Detergent Dispenser Assy
Insert a cardboard cut-out---behind the Wire Harness---to further isolate the wiring from the Tar-Like Thermal/Sound Insulation of the door liner.
<<<I haven't fixed appliances before, but I'm a DIY guy in general.>>>
In that case---I'll provide some recommendations to further improve the dishwasher performance & reliability (especially if you are planning to replace the Sump Assembly).
Replace the following items:
1) Guide Assembly (4975DD1001A)
The Guide Assembly has been updated (improvement)---to eliminate the oft-elusive symptom of once-in-a-blue-moon water leaking from the lower corner of the door.
Replacement Guide Assys include a new FLOAT ASSY. Not only has this been re-designed (elimination of Styrofoam floats)---but since Tri-Sodium-Phosphate (TSP) is no longer used in dishwasher detergent (beginning July 2010---many FLOAT ASSYs are becoming clogged with fatty/greasy residue. This in turn---causes incorrect water fill/filling then draining/poor wash performance/water-on-floor-complaints.
This accumulation of sticky residue is becoming so commonplace---that replacing the Guide Assy is virtually mandatory (when I service an LG dishwasher).
Prior to July 2010---TSP in dishwashing detergent would chemically-react with the fatty/oily deposits in the dishwasher---and CONVERT it to a soap/detergent.
This chemical change (fat-to-detergent) is called "Saponification".
Today---dishwasher detergent cleans---not by saponification---but by "Enzyme" method (breaks down fatty/oily deposits into smaller pieces).
Hence---the oily/fatty residue remains with the wash water---and ideally or in theory---should be eventually rinsed/drained from the dishwasher---provided that the cycle duration/run time is longer than a "normal" cycle AND the wash/rinse water temperature is hot enough to effective remove the residue---sufficiently.
My experience has been that---over time---deposits will gum-up the Guide/Float Assy (and the hose leading to it from the Sump Assy) to the point of rendering the dishwasher essentially useless.
It's also why I believe that LG introduced an all-new re-designed dishwasher---shortly after the TSP-ban (entirely different water level sensing method---a water frequency sensor rather than using floats).
As an option---the Drain Hose (AEM6943803) can be replaced as well. This re-designed hose is intended to be used with the (also re-designed) Guide Assy. The correction was to prevent loss-of-wash-water during the Wash Cycle---especially in situations where the drain hose has been incorrectly installed into the floor---to a drain connection in the basement/crawl space.
This would eliminate "air sucking sounds" and heating element damage due to frequent insufficient amount of water in the tub during the cycle.
Lastly---installing a new (yes-re-designed) Filter Assy (ADQ32598202) can reduce the possibility of hard debris entering the Sump Assy during the cycle. The filter area has smaller openings to resist glass shards and other debris---such as a toothpick.
Before I forget---if you've replace the Sump Assy---and all works beautifully---but now you're noticing a whistle/growling sound during the wash cycle---post back:)
The CHOPPER/MASCERATOR was inexplicably changed from a good design with not-so-pointed ends on it----to a design which best resembles the tip of an indian arrowhead.
This pointed tip---causes whistling and/or grinding during wash.
The original Chopper was brought back---to stop the noise complaint (sigh).
Source: LG LDF6810ST Error Code "LE"