As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A MAINTENANCE WALKAROUND IN MSP, A MECHANIC NOTED OIL CANNING ON THE LEFT SIDE OF THE FUSELAGE AFT OF THE CARGO DOOR AT FS 512.8. REPAIRS WERE COMPLETED BY FABRICATING AND INSTALLING AN EXTERNAL DOUBLER IAW FAC SRM 53-90-20. (M)