As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YVR - MAJOR REPAIR - DURING C-15 CHECK 2 EACH 1INCH CRACKS WERE FOUND ON FLOORBEAM STRUCTURE AT AFT END OF AILERON TOWER SHAFT QUADRANT CUTOUT BS 676, LBL 24.5. MAINTENANCE REMOVED ANGLE AND STIFFENER AT BS 676, RBL 24.5; FABRICATED DOUBLERS; INSTALLED REPAIR PARTS IAW SB 737-57-1139 & E.O. 5715-01007.