What was found
IMMEDIATELY AFTER TAKEOFF EXPERIENCED MAIN ELECTRIC TRIM FAILURE ACCOMPANIED WITH SPEED TRIM LT LATER ENGAGES AUTOPILOT A EXPERIENCED STAB OUT OF TRIM LT. COMPLETED QRH PROCEDURES FOR SPEED TRIM FAIL, STAB OUT OF TRIM FAIL ELECT STAB TRIM INOP CHECKLIST MADE FLAP 15 LANDING. REMOVED AND REPLACED STAB TRIM MOTOR AS PER AMM 27-41-71 OPS CHECK GOOD. PERFORMED LAND VERIFY TEST ALL TEST GOOD NO FAULTS. A/C REMAINS "AUTOLAND" A/C OK TO CONTINUE ROTABLE PARTS CHANGE WAS INDICATED - TT # 1497123 SN OFF 02142 MOTOR, STAB, HO OFF 29-2741-9-0008 2142 ON 29-2741-9-0008 2387. AIR RETURN.