As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TAILBOOM SENT FROM A CUSTOMER IN THE USA FOR REPAIR OF A DAMAGED SKIN. DURING DISASSEMBLY THE TAILBOOM TO FUSELAGE ATTACHMENT RING FOUND CORRODED. AT THE 1:00 AND 11:00 O'CLOCK POSITION DEPTH 1 MM AT THE 2:00 AND 10:00 O'CLOCK POSITION 0.2 MM AT THE 6:00 O'CLOCK POSITION DEPTH OF 0.6MM.