I think it was a space heater that heated up the bus bar. Hot weather gone!
Owner stated sh just purchased the rig. As stated a gasser, Panel below the closet. Four screws the unit pulled out. 120VAC breakers on the left, 12vdc fuses on the right. Stated xfer switch on the top rear but it appears like a small case for Xfer switch maybe a small relay in the back.
MrWizard, You must not be living out this way because not much happening at Rice Ranch at the moment. Rice Ranch suffered some damage during the last monsoon.
It's indeed a breaker panel, As stated above "might" be a relay on the backside. Don't think a the complete panel would need to be replaced if just the bus bar was overheated.
This looks like it would be a good replacement BUT no Home Depot here.
Don't really want to give the name of the RV shop!
I'll take a PIC & get more info "IF" I swing back by. Thanks again everyone.