We have a Dometic RM2554 3-Way Refrigerator that has stopped working. Control panel in front works. Propane, DC, and AC works and comes on. I took a multimeter and check the 2 glass fuses and the 30 amp slotted fuse and all good. It is getting AC and DC power to the control board in back. There appears to be no ammonia leaks. The hot side is getting hot, but cold side is not getting cold. Attached is a picture of the back of ours. Is there any pressure switch, or valve that can be reset, or anything else I am missing? Thanks in advance!