What was found
STABILIZER FAILS TO TRIM NOSE UP AND NOSE DOWN ELEC STAB TRIM FAIL BOTH CAPT/FO BOTH DIRECTIONS. CB CHECKS NORM AL CREW REPORTS APU OVERSPED DURING DEICING. AUTO PILOT DID NOT WORK, MANUAL TRIM OK. FOUND POWER GOOD TO THE MOTOR. REPLACED STAB TRIM MOTOR IAW MM27-41-71. OPS TESTS GOOD IAW MM 27-41-71-700-801 AND MM 27-41-00-700-807. ROTABLE PARTS CHANGE WAS INDICATED - TT # 0103850 SN OFF 2176 IPC REFERENCE # IPC 27-41-81-03 MOTOR, STAB, HO OFF 29-2741-9-0011 2176 ON 29-2741-9-0011 0745