As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCQ - MAJOR REPAIR - DURING C-17 CHECK FASTENERS WERE FOUND PULLING THROUGH KEEL BEAM SKIN, SKIN LOOSE AT BS 724 TO BS 726, RBL 4. MAINTENANCE REMOVED KEEL SKIN FROM BS 661.75 TO BS 726.75; FABRICATED A NEW REPLACEMENT KEEL SKIN PANEL AND 3 EACH DOUBLERS; INSTALLED REPAIR PARTS IAW AWA ER 03-5310-02085-051.