What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS IN CRUISE, AP 1/2 COULD NOT HOLD LEVEL FLIGHT AFTER INSTRUCTIONS TO INCR/DECR SPEED. ALT TRIM WAS NOT TRIMMING. CHECKED ALT LONG TRIM WITH ALT TRIM SWITCH, NO MOVEMENT UP OR DOWN, ON GROUND SAME. (NO AUTOPILOT TRIM.) MAINTENANCE FOUND PIN E AND PIN D WIRES PULLED FROM CONNECTOR P10-436. REPAIRED PIN E AND PIN D AT CONNECTOR IAW WDM 27-42-01 AND STANDARD PRACTICES 20-31-15.