As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK LEVEL 2 CORROSION WAS FOUND ON THE LEFT O/B SEAT TRACK BETWEEN STATIONS 38.4 TO 236.0. MAINTENANCE REMOVED & REPLACED THE LEFT O/B SEAT TRACK BETWEED STATIONS 38.4 TO 236.0 IAW BOMBARDIER Q400 SRM 51-40-7, 51-42-05 AND 53-20-40. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.