Did a maintenance on a older Lennox furnace. Cleaned out the flame sensor and shop vac the entire unit. Clean flame sensor and also cleaned out trap for the high-efficiency drain I made sure everything was properly draining. Customer had already change the filter. Amped up the blower motor and inducer motor which were running as the furnace spec sheet says. Supply air time 133. Customer stated humidifier was leaking. There was nothing I could do about it except recommend her a new humidifier. System is operating properly at this point. M#G26Q3/4-100-6 s#5801E22098 filter size 20x25x1.