What was found
THE CARGO HANDLING SYS, ROLLER RAILS WILL NOT LOCK INTO THE SEAT TRACK CROWNS BETWEEN STA, S660-780 RBL 24.75 AND 45.5. DISCEPANT SEAT TRACKS ARE INCOMING. DUE TO THE DISCREPANCY EFFECTING THE PTF MOD , A REPAIR WAS PERFORMED ON STAM EA 757-5335-16-F4048 AND STAM NR 48525020001 AT STA 640-780, RBL 24.75 AND 45.5. THIS NR IS FOR TRACKING PURPOSES ONLY. "MAJOR REPAIR".