Help with Preventative Maintenance Checklist

[Chuck E.]

I currently self-manage my 7 rentals and want to keep this portfolio growing, while still self-managing. The key? Minimize annoying service calls and long term repair costs! Please help me add to this DIY preventative maintenance list I've assembled. Most of these items should be done annually, except for the changing the air filter of course. Note I'm in Arizona so things that pertain to a wintery climate aren't listed.

-Clean Dryer Exhaust Ductwork

-Clean Refrigerator Coils

-Clean Dishwasher

-Clean Shower Heads

-Inspect Sink & Toilet Fixtures for Leaks

-Replace Air Filter

-Re-Caulk Tub/Shower & Bathroom Floor

-Flush Water Heater

-Lubricate Garage Door Bearings

-Replace Batteries in Thermostat & Smoke Detectors

-Inspect slab for signs of termites; trench ground with Termidor every 5 years