As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WING SKIN CRACKED, APPROXIMATELY 3 INCHES LONG, DEVELOPED ON TOP SKIN AT STATION 63.45 RUNNING FORE AND AFT BETWEEN BULKHEAD AND MAIN GEAR SIDE BRACE UPPER ATTACH POINT REINFORCEMENT. SUBMITTER STATES THAT THEY ARE DIFFICULT TO DETECT PRIOR TO BECOMING 3 INCHES IN LENGTH, DUE TO CARPET AND OTHER ITEMS. THEY REPORT HAVING REPAIRED 3 SIMILAR CRACKS IN C401 AND C402 AIRCRAFT.