As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER REMOVING THE FWD PIT AFT BULKHEAD PANEL 121HW THE CENTER LOWER BULKHEAD SUPPORT IS FOUND TO BE CORRODED. GROUNDED - YES. REMOVED FLOOR PANEL 120EF PER B737-900 AMM 25-52-10; REMOVED AND REPLACED CENTER LOWER BULKHEAD ASSY PER B737-900ER SRM 51-40-02 AND BAC DWG 143A9481 REV-A; RE-INSTALLED FLOOR PANEL 120EF PER B737-900 AMM 25-52-10.