As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - DURING D-CHECK, A CRACK WAS FOUND ON THE HORIZONTAL FLANGE OF THE KEEL BEAM CHORD AT BS 540, LBL 6.30. THE CRACK WAS APPROXIMATELY 2 INCHES IN LENGTH AND APPEARS TO HAVE ORIGINATED AT THE AFT MACHINE STEP AND TRAVELED FORWARD. REPAIRED CRACK PER EA 5310-01315. (W)