1. Genny? That's a tough one, I'd tackle it myself if you can get to it. On ours, except for routine maintenance, I'd have to drop the unit out the bottom of the rig to access almost anything.
2. Refer? Many times it's the main board, you can replace them yourself fairly easily. If it's anything more than that, and you're going to be plugged in most of the time, consider putting in a residential unit. I rarely use mine on propane, we're either running the genny, plugged in or traveling a short enough distance that it doesn't lose it's cool.
3. Steps: Fairly easy for a do-it-yourselfer to swap out. If it's the motor/gearbox combo, many of them are repurposed car window motors. I'd take it out and go see someone at a well stocked auto parts store. If it's the stairs themselves, you should be able to get parts from the vendor or at an RV junkyard. Not difficult to work on at all.
