As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - "C" - DURING C-15 CHECK MAINTENANCE FOUND RIVETS AND CHERRY MAX FASTNERS LOOSE THAT SECURE KEEL BEAM PANEL BETWEEN WHEEL WELLS AT BS 663 TO BS 727, LBL 4 TO RBL 4, PANEL HAS TWO PREVIOUS REPAIRS. MAINTENANCE DRILLED OUT RIVETS AND REMOVED OLD PANEL, DRILLED TO FIT NEW PANEL AND INSTALLED IAW BOEING DWG 65-91879.