What was found
AFTER T/O, PASSING 5000FT, CAPT NOTICED NOSE DOWN TRIM STUCK AT 2.2 ANU USING BOTH. CAPT AND F/O YOKE CONTROLS AND SUITCASE HANDLES TO TRIM NOSE DOWN. ALL UNSUCCESSFUL. ONCE A/C STARTED TO ACCELERATE, PASSING 10K , 310 KTS A/P WOULD DISENGAGE. AT FIRST TRIM WOULD TRIM NOSE UP TO 3.2. ATB TO MEM DURING APPROACH. TRIM STUCK AT 2.7 ANU, APPROX 30 LBS STICK PRESSURE REQ DURING INITIAL AND FINAL APPROACH AND LANDING. T/S STAB TRIM AND FOUND STAB GEAR BOX LOW ON OIL (NO OIL WAS ON DIPSTICK). REMOVED DRAIN PLUG DARK COLORED OIL AND SMALL METAL PIECES CAME OUT. STAB DID NOT MOVE WITH EITHER TRIM. REPLACED STAB TRIM GEARBOX, LT AND RT DRIVE MOTORS, LT AND RT BRAKE UNITS. ALL IAW MM 27-43-30-4, 04-4, 44-01-4.