To the Dojo,
This SxS presented with a defrost failure--defective single-tube heater AND bimetal. Evaporator defrosted, those components replaced, and solid thermistors installed. Also, based on experience, I clipped the damper motor wires because I've witnessed boards shorted because of shorted damper wire. Buttoned everything up, and fridge began cooling.
Catch up to yesterday's frustrating call about frozen food. Pulling the control board cover, I ohmed the thermistors, guessing at correct values based on the GSS/PSS manual posted elsewhere; diagnostic mode never yielded useful results. What I know is a good board is getting data from good thermistors. It even cycled off a couple times.
Today I closed the damper three-quarters, and am having the customer watch it. I await your howls, rotten tomatoes, dead cats, and cries of "PCM!"
Red Tory Ty