As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE PERFORMING INSPECTION A CRACK WAS NOTED IN THE FRAME ATT BS 720F AT STRINGER 16R APPROX 5" LONG. CUT OUT DAMAGED PORTION DIM 5" X 2.5". FABRICATED REPAIR PARTS (ANGLE)FROM 7075-T6 DIM 15" X 5.5", FRAME FROM 7075-0 .080" DIM 15" X 7". INSTALLED REPAIR PARTS, NO OTHER DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.