COUCH´S VERTICAL MOVEMENT FAULT
Just covering all bases, you tried both sides of ganrty switches and desk control box.
I have found in the past vertical table issues were resolved by replacing the Inverter Panel assembly part #453567484751
I was thinking on the inverter too; however, I wonder why it works in service mode. If I turn the key in the gantry to service and put the service switch to on on the couch, I can move with the push buttoms the couch UP and DOWN.
You are correct. You are in service it bypasses all the normal operation. It is just the switches and motor. So if in an failed situation you can get the patient out safely.