Performed Platinum Comfort Club Membership Tune-Up on Heating System 2021 Heil split system w/16x25x1 filter. Heavy build up inside cabinet of furnace during last attempt for anniversary check. 70% eff flue piping had work done in September to fix previous issues, cleanliness possibly stemmed from that. Ensured clear drains, cleaned equipment, good gas pressures on heat and line temps for cooling, all electrical components in range with good amp draws. System is operating properly at this time.