cleaned coils, brushed and cleaned traps, added pan treatment tablets to pan. tested and checked all controls, wiring connections. tested temperatures, checked filters. checked refrigerant temperature and pressures, tested static duct pressure. tested blower operation, tested cooling operation to ensure working within manufacturer specifications Blower is pulling 1.2 amps Outdoor fan is pulling .8 amps Compressor is pulling 8.3 amps Subcool is 8 Superheat is 11 Temperature difference between return and supply is 29 Capacitor is within manufacturer specifications System is working to manufacturer specifications Did find nest thermostat failing and cutting out 24 volts to turn on outdoor unit. Replaced thermostat and tested system operation.system is now working properly