What was found
ALB - FLT 4873 - DURING FLIGHT, THE LEFT MAIN AND ESSENTIAL BUSSES FELL OFF LINE. HYDRAULIC PUMP FAILED AND GEAR DID NOT COME DOWN. PERFORMED EMERGENCY EXTENSION OF GEAR. LANDED IN ALB WITHOUT FLAP AND LOST NOSE WHEEL STEERING AND BRAKES, PDU P/N A2042C LEFT, P/N A2043C RIGHT. REMOVED AND REPLACED LEFT AND RIGHT POWER DISTRIBUTION UNTIS IAW AMM. OPS CHECK GOOD. (M)