Customer said ac was not coming on. Arrived to find stat turned off. Turned back on. Also found wadsworth breaker tripped. Reset breaker. Unit came on. Contactor made a very loud humming noise and was very rusty. Terminals on capacitor were very rusty. Spade connectors were cracking and rusted. These would have stressed the system causing the breaker to trip. Replaced and fixed all of this. Confirmed operation. 11 SH, 9 SC, 23 temp drop.