What was found
DURING CLIMB FROM FL390 TO FL400 AUTOPILOT PITCH MISTRIM ANNUNCIATOR ILLUMINATED. AFTER AUTOPILOT WAS DISCONNECTED, ATTEMPTED TO CHANGE TRIM USING ELECTRIC AND MANUAL ACTUATION AND FOUND IT TO BE JAMMED. DURING DESCENT THROUGH 10,000 FT, ELEVATOR TRIM BECAME RESPONSIVE AGAIN. PUMPED ACTUATER FULL OF GREASE UNTIL CLEAN GREASE CAME FROM ACTUATORS. RAN TRIM THROUGH SEVERAL TIMES. SEVICED ACTUATORS AGAIN AND RAN TRIM. OPS CHECK GOOD, AND NO MOISTURE PRESENT. WORK DONE IAW MM 12-21-01.