As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MX PERFORMING INSP IT WAS NOTED THAT AT STA 970 RBL 15 TO RBL 20 LOWER FLANGE ON THE FRAME IS CORRODED. FABRICATED SHEAR TIE REPAIR FROM 7075-0 .071" DIM 4" X 7" HEAT TREATED TO T6. INSTALLED REPAIR NO OTHER DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.