What was found
SEAT TRACK ATTACH TEE CAP HAS CORROSION OUT OF LIMITS AT LBL45 FROM STA BS760 TO STA BS850. REMOVED SEAT TRACK FROM BS 740 TO BS850 AT LBL45 IAW SRM 51-30-2. REMOVED, REPLACED AND INSTALLED NEW UPPER CHORD FROM STA BS 760 TO STA BS850 AT LBL45 IAW BAC DRAWING NR 65-16279 AND SRM 51-30-2. REINSTALLED SEAT TRACK SECTION FROM STA BS 740 TO STA BS850 AT LBL45 IAW B727 SRM 51-30-2. THIS IS A MAJOR REPAIR SIGNED BY MECH NR 110487 AND QC303 REF SNRM N01130.