As a next step, if you find low power at the coach batteries, it might be good to verify that the 110AC disruption did not make the converter trip a breaker or fuse on it as it is what charges the coach batteries.
What I'm finding on it is a little vague but you may know where and how to find it. This drawing is what I get for location and though to pass it along, as a way to speed the search. It looks to be on the right side and forward may 8-10 feet from the bedroom TV, possibly under a panel in a cabinet?? They leave us guessing on details at times!
If the batteries look down, check the converter for 110 AC going in and also that any GFCI, breaker ,etc. on it is not tripped?
EDIT: Better location on converter in second picture
2015 Winnebago Vista 31KE on 2014 chassis