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 INSPECTIONS IT WAS NOTED THAT STRINGER 27 RIGHT AT BS. 720D HAS CORROSION. DAMAGED ARE WAS REMOVED DIM 48.5". LOCATED AND INSTALLED NEW STRINGER. NO OTHER DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.