Possible fix for hot water issue
We had a similar problem with our Adventurer. Plenty of hot water everywhere but in the shower. We took it in for service and the tech told us he blew compressed air back through the shower hose and was able to dislodge whatever had clogged the mixing valve without having to disassemble anything. We haven't had another problem since (about a year). Keep the air pressure LOW (no more than 30 psi) or you risk creating more problems.
Eric & Karen, South Lyon, MI, 2015 Winnebago Sightseer 36V