As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING MODIFICATION TO THE FWD FUSELAGE FRAME "BIRDCAGE" IAW STC SA97-88, A LOT OF CORROSION HAS BEEN VISUALLY DISCOVERED ON THE LOWER TUBES. IT HAS BEEN DETERMINED THAT IT WOULD BE CHEAPER AND FASTER TO CHANGE THE BIRDCAGE RATHER THAN REPAIR IT. THIS BIRDCAGE HAS BEEN SENT AS A CORE EXCHANGE AND THEN SENT FOR FURTHER EXPERTISE.