As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN AFT WET AREA STA 947 FLOOR BEAM HAS CORROSION ON UPPER SURFACE LBL 27 AT I/B LAV MOUNT. GROUNDED - YES. REMOVED CORROSION-ORIGINAL THICKNESS 0.180,REMOVED .029,REMAINING .151AND FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-70-51-1A-1TOOL # T8363L CAL DUE 03/16/2023ACCOMPLISHED FLOOR BEAM REPAIR IAW B737-800 SRM 53-70-51-2R-5THIS IS A CATEGORY "A" REPAIR.