As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING INSPECTION, A LARGE CRACK WAS FOUND ON UPPER VERTICAL FIN NEAR THE FWD ATTACHMENT POINT. CRACK IS LOCATION ON L/E EXTENDING FROM RT SIDE TO LT SIDE OF ACFT IN THE AREA ABOVE THE FWD REINFORCEMENT. TOTAL LENGTH OF CRACK IS 8 INCHES. COULD BE IMPROPER SHIMMIN OF VERTICAL FIN OR FATIGUE OVER TIME.