As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND RIGHT INBOARD SEAT TRACK FROM FS 10.0 TO 103.0 MULTIPLE AREAS OF SURFACE CORROSION. MX REMOVED AND REPLACED THE RIGHT INBOARD SEAT TRACK RAIL P/N 85328210-115 IAW Q400 SRM 51-4-05, 51-40-10, 51-40-15, 51-41-00. A/C REMAINS IN TUS FOR HEAVY CHECK COMPLETION.