As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*****MAJOR*****WHILE AC WAS IN FOR HEAVY CHECK FOUND LT WING LOWER SKIN LE SUSPECTED CRACK BETWEEN SLATS 3 & 4 APPROX 4 INCHES IB OF RIB 20. MX PERFORMED A TEMP REPAIR OF LT WING LOWER LE SKIN PN 170-01424-003 APPROX 4 INCHES IB OF RIB 20. IAW ETD2019-170-049641-A. SEE NRC 4000427-5000-0006 FOR WORK PERFORMED. *****MAJOR*****