Blue shield protection plan fall Furnace tune up on 2011 Lennox 80% gas furnace. Spoke with home owner and no issues had been noticed since turning in heating equipment. Filters were just replaced so I left 2 14x30 and 1 14x24 filter with customer, included with Blue SPP. Checked thermostat, and went into attic and checked whole house, germicidal air purifier lamps, and both were installed in October 2020 and are currently out. Checked flue, evaporator coil, drain line, inducer capacitor, blower, and heat exchanger from both sides. Cleaned flame sensor and spoke with homeowner about UVC UVV lamps. With Approval, I changed them and cycled the system on. Tested blower, inducer, gas pressure, replacing gas caps and electrical. Measured temperature split. The inducer motor is reading at the top of its range at 2.6/2.6 amps. Performed dryer vent cleaning with homeowner approval. It is a 3” pvc pipe through the attic, so it has a tendency to get clogged at the roofline. Cleaned out with 2 pa