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 RIGHT OUTBOARD SEAT RAIL IN SEVERAL AREAS BETWEEN FS X236.0 & X564.5. MAINTENANCE REMOVED AND REPLACED THE RIGHT OUTBOARD SEAT RAIL BETWEEN FS X236.0 & X564.5, IAW BOMBARDIER Q400 SRM 51-42-45, 51-40-15, 51-40-07 & 51-42-05. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.