As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AN 38MM CRACK IN THE UPPER FIN WAS DISCOVERED DURING A DAILY INSP. THE CRACK IS LOCATED ON THE INNER LT UNDERSIDE LOWER L/E RIB STARTING FROM A RIVET AND PROGRESSING AFT ALONG THE RADIUS. ACFT WAS PLACED OUT OF SERVICE AND THE UPPER FIN REPLACED.