As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, CORROSION WAS FOUND ON THE LOWER RT INBD FRONT WING SPAR FITTING, BETWEEN THE THIRD AND FOURTH REAR RIVET ROW, FROM INBD. AFTER THE FITTING WAS REMOVED FURTHER INSPECTION REVEALED NO OTHER DAMAGE NEITHER ON THE FITTING NOR IN THE SURROUNDING AREA OF THE CARRY-THRU BOX SPAR. THE ENTIRE EXTENT OF THE DAMAGE WAS EASILY VISIBLE WITH AND INSPECTION MIRROR AND A FLASHLIGHT. FITTING WAS REPLACED IAW MM.