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-20 CHECK A 1/2" CRACK WAS FOUND ON BELT FRAME DOUBLER BS 303, BETWEEN STRINGERS 16 AND 17 L/H. MAINTENANCE REMOVED CRACKED DOUBLER, FABRICATED A NEW DOUBLER, AND INSTALLED REPAIR IAW DWG 65-17684, AND B737-200 SRM 51-10-1, PG. 8.