As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON ANNUAL INSPECTION, A SKIN DEFORMITY WAS FOUND ON UPPER SPAR OB OF FUEL CELL. RIVETS ATTACHING SKIN TO SPAR WERE DRILLED OUT EXPOSING SEVERE CORROSION OF SPAR CAP. IT WAS DETERMINED FROM THE EXTENT OF CORROSION THE SPAR WAS UNSERVICEABLE. SUSPECTED THAT THE ROAD SALT CONTAMINATE FROM THE NEAR BY HIGHWAY WAS A FACTOR IN THE CAUSE OF THIS CORROSION.