As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A CRACK WAS FOUND DURING A 300 HOUR INSPECTION OF THE VERTICAL FIN. THE CRACK WAS FOUND ON THE RIB AT APPROX. WL 235.2 MM, STA 9725.0 MM, AND RAN FROM STA 9623.4 MM TO 98266 MM. THE MANUFACTURER WAS CONTACTED FOR INSTRUCTIONS ON SERVICEABILITY. A LETTER FROM ENGINEERING PERMITTED THE AIRCRAFT TO BE FLOWN AN AUDITIONAL 100 HOURS PROVIDED DAILY AND 25 HOUR INSPECTIONS WERE PERFORMED.