Tires, brakes, wheel bearings, sanitize fresh water tank and lines, clean holding tanks, be sure vents on furnance, hot water heater, and refrigerator are clean. Check pressure relief and annode on hot water heater, be sure electrical connections in breaker panel are tight. I'm sure others will be here to make other suggestions. Lots of knowledge at this site. These are not things so much to repair and/or replace but some things to check into.
