dying unit

Does anyone have a schematic for this thing? 2 different depts had issues, we pulled 1 wire off what I think is a power distribution pcb, and most of the micu started working again. A couple of the nurse call units won't quiet, 3 beds and the soiled utility rooms are dead. In our ccu, the same wire got the system back online, but all of the nurse calls are dead, only the overhead page works. I'm the new guy in this shop and there is no documentation here. The company that used to handle it refuses to come fi it b/c we're replacing it. we have 1 dept where 3 beds are