If I understand you correctly, you have two separate problems, probably not related.
The first problem is that the rear interior light circuit blows the fuse when the bathroom wall is put up and down. This suggests that something about the switch - the switch under the edge of the bathroom wall, that turns power off to the entire rear of the trailer - is not right. In my 2720 (not sure about your 3023), I can physically see the switch by peering into the rear storage compartment from outside. The switch must be firmly mounted, and should not move when the bathroom wall is put up / taken down. If it moves, one of the terminals might short out against some adjacent metal, such as a wall panel, which would blow the fuse. Reach in, grab the body of the switch, and try firmly to wiggle it around. Or, one of you watch the switch to see if it moves while the other of you puts the bathroom wall up and down a few times.
For what it is worth, the wires to the rear interior lights are pretty well protected where they run through their channels inside the trailer, so I wouldn't expect your electrician to have to pull new wires. On the other hand, the wires run to the roof as part of the bundle which is outside the TM, zip-tied to the lift arm on the left side of the trailer. This bundle flexes when the roof goes up and down, so it is possible that a short has developed inside the bundle. However, your description of the problem describes raising and lowering the bathroom wall, not raising and lowering the shells. So I'm still looking at that switch.
The second problem is that the circuit breaker for the AC outlets sometimes pops when the TM is opened up or closed down. First thing to note is that there are no outlets in either of the upper shells. All the outlets are in the lower shell (the box, if you will), so nothing is expected to flex when the shells go up and down. I'm assuming that the breaker which pops is the breaker associated with the outlets (15 amps), not the main breaker (30 amps), is that correct? Assuming it is correct, next question is whether that 15-amp breaker is a standard breaker, or a GFI breaker? If it is a GFI breaker, is it the normal (overload) part of the breaker that pops, or the GFI part?
Bill
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