well, both roof A/Cs and control boards, Aqua hot board, Aladdin tank level board (used from salvage yard), Cab A/C (new compressor), Slide out mechanism (pass side and drivers side), microwave, black tank valve, radiator surge tank, cab clearance lights (leaks), Slide out latch mechanism; that's what I can pull off the top of my head. Like I said, the labor is the thing that adds up quickly! As far as the engine, just routine maintenance ($500 oil changes), air and fluid filters; no issues with tranny. And tires!