As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT WET AREA, CORROSION ON INTERCOSTAL AT AFT O/B FLOOR MOUNT FOR LAV E. GROUNDED - YES. REMOVED CORROSIONORIGINAL THICKNESS .080, REMAINING .041, REMOVED .039 AND FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-70-51-1A-1.REMOVED AND REPLACED INTERCOSTAL P/N 147A5660-22 IAW B737-900ER SRM 51-40-02 REF BAC DWG 147A5650TOOL# T8224K CAL DUE 10-13-2022.