As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MHV - LEFT INBOARD FLOOR STATION 484 HAS RIVETS PULLING THROUGH AND BOTH ENDS OF ALL STIFFENERS ARE CRACKED ON 484 AND 520. REMOVED DAMAGED STIFFENERS. FABRICATED NEW STIFFENERS LOCATED AND DRILLED IAW SRM 51-01 TREATED AND PRIMED IAW SRM 51-10-3. INSTALLED STIFFENERS IAW SRM 51-30-2 DC9. (M)