Dometic refrigerator left off for 10 mo. not working

No...just one fridge...neighbor's. An RV tech did look at it and said it was a problem with the "electronics", think he meant the board so I'd like to help her and save her the money. The board I ordered is returnable. The fridge has an element too? I'll google...she left it to spend the winter in Mexico. The trailer wasn't moved. And it did snow one day so it could have gotten pretty cold. Don't know if that was enough to affect the ammonia.