As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE LEFT INBOARD SEAT RAIL BETWEEN STATIONS X564.5 TO X664.5. MAINTENANCE REMOVED AND REPLACED THE LEFT INBOARD SEAT RAIL BETWEEN STATIONS X564.5 TO X664.5 IAW BOMBARDIER Q400 SRM 53-20-49, 51-42-05, 51-40-15, 51-40-10 & 51-42-05. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.