What was found
MAIN DOOR MOTOR SWITCH: MAIN DOOR (AIRSTAIR) FAILS TO OPERATE (CLOSE) UPON PRESSING 'AIRSTAIR DOOR' BUTTON (LOCATED AFT OF COCKPIT) OR WHEN SELECTING 'AUTO' ON EXTERNAL 'DOOR OPERATING SWITCH' (LOCATED ON FUSELAGE AFT OF AIR STAIR). SELECTING 'MANUAL' ON EXTERNAL DOOR OPERATING SWITCH DOES OPERATE THE AIR STAIR DOOR.///SIGN-OFF///REMOVED AND REPLACED RDE#1. MAIN CABIN DOOR OPS CHECKS GOOD. REFERENCE GL 6000 AMM 44-10-40 AND GL 6000 AMM 52-11-00.