Found system operational upon arrival. Replaced m1620255 Lennox hepa filter. Blower clean. Wheel clean. Board ok. Transformer ok. Evaporator coil clean. Washed condenser coil. Checked Freon pressures. Levels ok. Amp draw on motors within range. Motor controls working well and in range. Line voltage switch working well. Customer added 1 year ESM with 2 visits. Recommended extended warranty but customer declined. Understands Lennox only covers parts warranty and not labor, Freon, diagnostics, or warranty processing. Unit operational upon departure. 1. Recommend extended warranty from Lennox for full coverage. 2. Customer does not have air cleaner or purification to protect equipment.