What was found
ROLL TRIM ANNUNCIATOR ILLUMINATED IN CRUISE. AUTOPILOT MANUALLY DISCONNECTED TO RETRIM AILERONS. AILERON TRIM WHEEL STUCK & WOULD NOT MOVE LT OR RT. ROLL TRIM ANNUNCIATOR STAYED ON FOR 80 PERCENT OF THE FLIGHT. ON GROUND, ABLE TO MOVE AILERON TRIM. CHECKED AILERON TRIM MANUALLY & FOUND TO MOVE FREELY. COMPLIED WITH AILERON TRIM ACTUATOR LUBRICATION. WHILE INSERTING GREASE FOUND WATER TO BE PURGING FROM ACTUATOR- PURGED GREASE AND WATER SEVERAL TIMES. CHECKED GOOD IAW MM CH 27-90-10. OPS CHECKED AUTO-PILOT- CHECKED GOOD IAW MM CH 22-11-03.