Hi, not sure if you found your problem but if the Mirinmar coach uses a BCC cabinet like my ACE 30.1 there is a 50 amp resettable mini breaker located on the circuit board inside the BCC cabinet located (on my ACE 30.1) in the front engine bay. It is awkward to get to but possibly this is your issue. There is a web posted link that refers to this mini breaker on top of page 100.
If all other switches and latching relays are working, this might be your problem. Hope that helps