As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. UPPER CARGO SEAT TRACK LEFT BUTT LINE 54 STATION 668-788 HAS CORROSION THAT IS OUT OF LIMITS IN SEVERAL AREAS. REMOVED AND REPLACED SEAT TRACK LEFT BUTT LINE 54 STATION 668-788 IN ACCORDANCE WITH SRM 51-40-02 PAGE 7 PARAGRAPH 7D AND IN ACCORDANCE WITH DRAWING 368-53-16-94405. PRIMED AND PAINTED IN ACCORDANCE WITH SRM 51-20-00 PAGE 1 PARAGRAPH 1C.