As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-13 CHECK EXFOLIATION CORROSION WAS FOUND ON THE FORWARD LAV PAN RING AT BS 275. MAINTENANCE REMOVED EXTERNAL DOUBLER AND LAV PAN RING; FABRICATED A NEW EXTERNAL DOUBLER; INSTALLED REPAIR PART AND LAV PAN RING IAW B737-200 SRM 51-30-2, SRM 51-30-5, AND SRM 51-30-8.