Smitty, you nailed if as usual!
I have the C15 with a burner, no issues until this past trip. Had to replace the temperature probes and when I got home had the burner system cleaned, all good now.
Issues I've had or to check:
Axle seals and front wheel seals
I never lost a engine belt but put a new one on and replaced all the idler bearings, no issue just to be safe. Prior to me coach was by the ocean quit a bit.
Tires and year
Batteries and year
Engine hoses, I replace several, again as a precaution
All fluids and filters changed
TV's and Satellite, updated
I had quite a bit of front end play. Upgraded drag links and bearings to a system by Kaiser, worked great.
Service Aqua Hot, never had an issue otherwise.
Generator service and filters.
Upgrade headlights to LED, stock lights are so bad.
Others touched on foggy windows, all mine eventually did fail. The Affinity windows are a bit more to repair due to the flush glass.
I did a ton of interior upgrades, to suit us. Mood lights, upholstery and LED lighting.
Lucky, I can do most all this work myself, a labor of love, at least I keep telling myself that.
Overall a wonderful 2008 45' Affinity. Love the C15, will out-pull a Cummings 600.