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 A 2 INCH AREA OF EXFOLIATION CORROSION WAS FOUND ON STRINGER 25 RT, AT BS 978 WATER TANK COMPARTMENT. MAINTENANCE CUT OUT CORROSION ON STRINGER 25 RT AT BS 978; FABRICATED A REPAIR SPLICE (HAT CHANNEL); INSTALLED REPAIR PART IAW B737-200 SRM 53-10-9 FIG 1.