As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT GROUNDED FOR HEAVY MAINTENANCE. SKIN CRACKED AT STATION 1641 APPROXIMATELY 2" FROM RIVET HEAD TO FORWARD UPPER CORNER OF OUTFLOW VALVE CUTOUT. REPAIRED DAMAGED SKIN AND INTERNAL DOUBLER IN ACCORDANCE WITH ENGINEERING DOCUMENT REA 47247REA04.