What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE RIGHT INBOARD SEAT RAIL BETWEEN STATION X236.0 & X564.5, MAINTENANCE REMOVED & REPLACED THE RIGHT INBOARD SEAT RAIL BETWEEN STATION X236.0 & X564.5, IAW BOMBARDIER Q400 SRM 51-40-07, 51-40-10, 51-42-05, 51-40-15 AND DWG 85361501. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.