As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 2556650) DURING INSPECTION FOUND CORROSION ON WASTE PAN PRODUCTION DOUBLER (INNER SURFACE ) BTW STA.Y=850 AND STA. Y=860 AT AFT CARGO COMPARTMENT. WASTE PAN PRODUCTION DOUBLER ( INNER SURFACE ) BTW STA.Y=850 AND STA. Y=860 AT AFT CARGO COMPARTMENT WAS REPLACED PER B737-900ER SRM 51-40-02-0G.