As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. AFT SIDE OF FRAME AT STATION 742 OUTBOARD STRINGER 39R IS CORRODED. REMOVED AND REPLACED SHEAR TIE AND CLIP FROM FORWARD LOWER CARGO STATION 742 STRINGER 39R WITH NEW PART IN ACCORDANCE WITH DRAWING 143T1214.