As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: WHILE REMOVING LEFT INBOARD AFT SEAT TRACK, STIFFENER AT STA 927, LBL 24.75 HAD SEVERAL ELONGATED HOLES THROUGH WEB/STIFFENER. REPLACED STIFFENER AND INTALLED FREEZE PLUGS FOR ELONGATED HOLES REF EA 327365 AND B737NG SRM 51-20-10-0G.