Completed comprehensive preventive maintenance on Rheem 96% AFUE two-stage furnace. Performed combustion analysis showing 96.8% efficiency after adjustment. Measured static pressure (0.35"WC), verified inducer motor draw (1.2A), tested pressure switch activation (0.65"WC), and confirmed gas valve modulation. Heat exchanger inspected with borescope—all cells clear. Cleaned flame sensor (measured 3.8μA improvement), adjusted gas manifold pressure to 3.5"WC, and calibrated anticipator settings. Replaced PSC blower motor capacitor showing 7% degradation. System now operating at peak efficiency with 0.02% CO output at flue.