As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE FOUND RT SEAT TRACK CORRODEDFRAME 12 TO FRAME 21; RBL 9.5"-RBL 12.5". REMOVED CORROSION BY BLENDOUT REF SRM 51-10-03; 51-21-01. FOUND TO BE OUT OF LIMITS REF SRM 53-10-10, MATERIAL LOSS 0.062". REMOVED SEAT TRACK REF. SRM 51-41-01;51-41-02. LOCATED; DRILLED AND TREATED NEW BEAM REF SRM 51-23-04; 51-40-01. INSTALLED SEAT TRACK AND TOP COATED REF SRM 51-41-01;51-41-02; 51-43-03;51-43-04. THIS ITEM HAS BEEN CLASSIFIED AS A LEVEL 2 CORROSION.