Since the definition can be made up to suit anyone it can be used by minimal inspectors to report less to gain referrals from realtors that remember how little they report on houses.
Some quick examples:
Disposal runs and does not drip but has a rusty crack on the side of it or makes more noise than typical.
Garage door goes up and down with the opener but has no spring balance left.
Bathroom fan runs for 15 seconds then starts making noise.
Furnace runs and puts out heat but draft inducer has debris in it making noise.
Shower works but tub faucet still has some flow out of it with shower running.
Thermostat relays that chatter when changing modes.
Water heaters that are older than their design life.
Condensor fan with oil leaking and blowing across the side of the motor.
Toilets that are not leaking but loose on the floor.
A “vented crawlspace” that is actually not venting due to ducts etc in the crawlspace and bushes around the exterior.
A Zinsco or FPE Stablok that has not faulted yet.
Condensate pumps that are not wired to the low voltage HVAC control.