What was found
AT CRUISE FL340, AUTOPILOT LIMIT ANNUNCIATED. UNABLE TO PITCH TRIM WITH ELECTRIC OR MANUAL. AP COUPLED NO OTHER INOPERATIVE/FAIL OR PUSH INDICATIONS. UNABLE TO PITCH TRIM DURING DESCENT THROUGH LANDING. FOUND PITCH TRIM CABLES AND PULLEYS, RIGHT SIDE HAD ICE JUST AFT OF PRESSURE BULKHAD. ICE HAD FORMED FROM LEAK AT AFT NR 4 LAV SINK ONTO CABLES IN C3 PIT AFT BULKHEAD. TRIM OPERATES NORMAL, NORMAL WHEN ICE REMOVED. REPAIRED DRAIN LEAK. LUBED CABLES. (M)