Same thing happened to us. Finally noticed the floor that the washer set on was made out of something like masonite and sometime had been damp and therefor had a low spot and the washer did not set level even tho the coach was level. Put a different floor under the washer so that it set level and no more leakage.
Think Doug is on to it. I have a 50 amp Service Distribution Panel Model 750 and beside it is a 12 volt panel with fuses and along the edges from the fuses are 6 rather large plug ins with wires in them. When one of the white plug-ins was not pushed in good I had the same problem you seem to be having. . . no display although many things worked. Check and make sure those plug-ins are seated good.