Freezer temp 17 degrees, thick frost coating the evap cover. We await resolution of a landlord/tenant dispute as to who pays the bill before proceeding.
I suspected the damper, but pending the forced-defrost test, looks like you nailed it. Huzzah!
Meanwhile the beer side has started cooling again. I informed the tenants a goofy board will misbehave like this, but sooner or later they will wake up to a flood of melted goodies and bins full of spoiled food. And who pays for that?
Then the error codes cross reference to status lights. According to the chart at the top of page 7 of the tech sheet an F31 (which I suspect you got) will light up Add A Garment and a couple others during pump test mode depending on your exact model.
In which case you might be looking at a(n) MCU board. Unless I'm misreading the tech sheet, which I don't think was written by an Englishman. Anyway a bad control, in the absence of any mechanical factors like socks escaping the basket and dragging, would explain the slow-motor/poor-drainage scenario.
You haven't relocated or extended the drain hose recently have you? Any plumbing/drainage issues in the house? Not frozen solid by any chance?
Your drain flow may not be as good as you think. Disconnect the pump and run spin. How now? If it does not spool right up without pump, listen for problems like maybe something dragging the basket, use your nose in case the motor is hot and on the brink of failure, you can smell that as well as feel the motor (not when when running!) for high temp.
That thread linked by Durham discusses the balance rings, which are fluid filled. This is the case also with Whirlpool DD. Sort of like hydrostatic flywheels. But there is apparently a coefficient of weight-of-basket to weight-of-balance-ring fluid. If any fluid leaks out you get wild-ass gyrations instead of nice smooth spin. This explains the problem we've had with three successive Whirlpool DD's, I do believe. Nothing worked to correct the hippy-shakes - not pads, not springs, not lube, not nothing.
Fortunately on DD's, no harm is done. They can fandango right across the floor to the other side and come back for more. Right now I've got one that even broke a weld to the cover and it still soldiers on. Woe to anything that gets in the way, of course.
Cabrio, I don't know. Maybe they self destruct that way.