As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE CHECK, CORROSION WAS FOUND OUT OF LIMITS APPROX FS 410 LBL 21 ON SEAT TRACK SUPPORT ANGLE OF MAIN CABIN FLOOR STRUCTURE. REMOVED CORROSION FROM FLOORBEAM IAW B727 SRM 511006. FABRICATED NEW SEAT TRACK BAC 1520792. TREATED AND PRIMED IAW B727 SRM 512002 MM 511002. INSTALLED IAW B727 SRM 513002.