Arrived on site to perform fall tune up. On unit. 20 year old unit. Filter was good. Furnace is located in attic. Cycled heater and is operational. Blower ass and whee is dirty. Motor is leaking oil on borrowed time as it’s working hard and needs a cleaning. Secondary control is bad and out of range and will fail if left the same. Inducer motor is operational but working hard from age. All safety switches are operational but worn out from age. Would recommend rejuvenation to unit to buy more time. Temperature rise is good. Unit is heating home good. Drain line is good at Thai time and clear. No protection on unit. Client he was okay on hearing recommendations and repairs and would just call us out of there is a issues advise I would still put recommendations in file. Client is okay and aware of condition and repairs needed to heater. Client did declined. Cycled system to ensure system operating. System is operational upon departure.