As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON LEVEL OFF AT CRUISE ALT, AS SPEED INCREASED TO 280 3/4 OF AILERON TRIM REQUIRED TO KEEP AIRCRAFT LEVEL. REDUCING AIRSPEED TO 170 OR SO THE AILERON TRIM ALMOST CENTERED. PERFORMED GVI OF LT AND RT AILERONS, FOUND ICE 1/8 INCH THICK ON LT WING FROM OTBD OF ENGINE NACELLE TO WING TIP. REMOVED ICE. PERFORMED OPS TEST OF AILERON TRIM SYSTEM, TEST GOOD IAW AMM TASK 27-13-00-710-802. OPERATIONAL CHECK FLIGHT GOOD. RETURNED TO SERVICE. NO PARTS REPLACED.