As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
***WHILE AIRCRAFT WAS OUT OF SERVICE FOR HEAVY CHECK*** MAINTENANCE FOUND CORROSION ON FWD FUSELAGE PASSANGER CABIN FLOOR STRUCTURE AT SEAT TRACK FR 12 TO FR 21 RBL 12". REPLACED SEAT TRACK IAW SRM 51-41-01, 51-41-02, 51-43-03 AND 51-43-04. AIRCRAFT REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.