What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE LEFT OUTBOARD SEAT RAIL BETWEEN STATIONS X236.0 TO X564.5 MAINTENANCE REMOVED AND REPLACED THE LEFT OUTBOARD SEAT RAIL BETWEEN STATIONS X236.0 TO X564.5 IAW BOMBARDIER Q400 SRM 51-42-05, 51-42-15, 53-20-49, 51-42-06, 51-42-45 & 51-40-10. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.