take a truck jack with you to lift the mower for underdeck inspection.
Spindle, rust, wear , how clean and dirty the chamber, engine power responsive when playing with rabbit and turtle throttle, oil, all the wiring and of course how good all the belts in place with pulleys. Is mower vibrating like crazy when cutting?
I don't want a thousand plus hour engine with leaky signs and rusty vibrating machine in my garage. Just a thought,lol.