Conducted comprehensive maintenance on Bryant 127ANA060 5-ton heat pump system. Inspected reversing valve operation: 24V energized in cooling mode, de-energized in heating. Checked TXV superheat: 12°F in cooling, within spec. Tested defrost control board cycling and termination. Cleaned outdoor coil with biodegradable foaming agent, rinsed thoroughly. Measured compressor amperage draw: 19.2A, within nameplate rating. Evaluated metering device performance: 11°F subcooling. Replaced 35/5 μF dual run capacitor proactively. Calibrated Ecobee SmartThermostat for optimal staging. System now operating at 16.5 SEER, meeting rated efficiency.