As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED THAT THE AILERON TRIM MESSAGE WAS DISPLAYED ON EICAS WHILE IN CRUISE AND THAT AILERONS WERE VERY STIFF. AIRCRAFT DECENDED TO A LOWER ALTITUDE AND PROBLEM CLEARED. CREW REPORTED THAT THERE WAS HEAVY RAIN ON TAKE OFF. AIRCRAFT LANDED WITHOUT INCIDENT.AILERON CONTROL CIRCUIT INSPECTED AND NO ANOMALIES NOTED. AFT QUADRANTS AND CONTROL PULLEYS CLEANED AND LUBRICATED AND AIRCRAFT WAS RETURNED TO SERVICE.