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 I/B SEAT TRACK BETWEEN STATIONS 236.0 & 564.0. MAINTENANCE REMOVED & REPLACED THE LEFT SEAT TRACK IAW BOMBARDIER Q400 SRM 53-30-49, 51-42-05, 51-40-07, 51-40-15 & 51-41-00. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.