What was found
FWD CABIN, RIGHT O/B SEAT TRACK, UPPER SURFACE HAS LIGHT CORROSION AS MARKED FROM STATION 420 -440, RBL 46" WL 208 REMOVED CORROSION BS 420 - 440, RBL 46, WL 208, ORIGINAL THICKNESS .070", .063 REMAINING .007 MAT LOSS. OUT OF LIMITS REF SRM 51-10-1, BAC 1520-792. SEAT TRACK SECTION REMOVED AND NEW SECTION INSTALLED BS 390 TO BS 480, ALONG WITH -4 ANGLES - 5 STRAP REF SRM 53-10-5 (PF) FIG 1, PGS 1,2,4. THIS IS CLASSIFIED AS A MAJOR REPAIR.