As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A HEAVY MAINT CHECK, CORROSION WAS FOUND ON SEAT TRACK BETWEEN STATIONS 1030 AND 1050 RBL 56 IN CABIN FLOOR STRUCTURE. CORROSION WAS FOUND TO BE OUT OF LIMITS IAW SRM B727 531001. REMOVED SEAT TRACK IAW SRM B727 513002. FABRICATED NEW SEAT TRACK IAW SRM B727 531003. TREATED AND PRIMED IAW SRM B727 511006. INSTALLED SEAT TRACK IAW SRM B727 513001.