Subzero Sealed System Repair

[cdubs20]

I have a builtin 36" bottom freezer subzero that is about 13 years old.  There is no cooling at all, the compressor is pulling about 7 amps  and cutting on/off from the overload.  The temperature of the compressor is around 135-140 degrees.  The start capacitor tested good and I tried a different start relay but it did not produce any cooling.  I tested the compressor windings and the Run/common is about 5.6 ohm and the start/common about 6.5, with start/run correctly around 12.1 ohms. LRA is 20.9 amps.  I tested each pin and none are shorted to ground.  I think this means that either the system is low on refrigerant or the compressor is bad.  

I am not sure how to proceed.  If the refrigerant leaked out, it may be a waste of time to add refrigerant that may again leak out if I can't locate a leak.  I am not aware of another way to determine if the compressor is bad or does this definitely sound like a low refrigerant issue?

Thanks

[cdubs20]

Correction: LRA 9.3 amps

[Vance R]

Check start and run amperage draw. If the compressor is running take the temperature of the condenser. In a normal system it should be 20 to 30 degrees above room temp.

[isaac]

As a last resort before going into a sealed system repair i would try with a 3 in 1 hard start (i am not a fan of those but some situation its a good way to get some extra time)  if it works you might get out of it a few more years and it will confirm no leaks,  if it dosn't kick with this you will need a new compressor,  the  compressors on this unit don't fail because of leaks usually,  (from my experience) 

Good luck