We've had several issues, mostly non-Phoenix problems and Phoenix has taken excellent care of us. Example: our furnace wouldn't work and was under Atwood warranty. We didn't want to drive to the factory so we tried to get it fixed by other RV repair shops. After several attempts (and much mental anguish) we gave up and waited until we could get to Elkhart. Kermit had his furnace guy come to the factory and take care of it while we were there. So we took up space at the factory while outside work was done. We got our house back with fully functional furnace and the warranty service receipt and we were good to go. FYI - when wee called about the problem, Kermit immediately authorized service at his cost if it turned out to be something the factory did. It was an Atwood problem so he didn't need to pay but he went out of his way to get us back up and running.
We are also total dweebs when it comes to mechanical stuff. From our experience and from reading the forum, I've learned that that the factory will help you troubleshoot the problem then walk you through the repair process as far as you want to go. If you want to disassemble the shower, they'll talk you through it. If you want to turn it over to a pro as soon as the leak appears, they're good with that also and will pick up the tab of it is still under warranty.