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 INBOARD SEAT RAIL BETWEEN STATION X -39.0 TO X9.50. (AT FWD LAV ATTACH FITTING). MAINTENANCE REMOVED & REPLACED THE RIGHT INBOARD SEAT RAIL BETWEEN STATION X -39.0 TO X9.50, IAW BOMBARDIER Q400 SRM 51-42-05, 51-40-15, 51-41-05 & 51-40-07. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.