As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLOOR SUPPORT AT STA 947-951 SEC 47 HAS CORROSION AT IB AFT LAV MOUNT DO 950-014. PERFORMED FLOOR SUPPORT REPAIR ON THE STA 947 R/H SIDE I/B UNDER LAV MOUNT. IAW B737-900 SRM 53-70-51-2R-5 PROCEDURE 5. (LOG 1577564 - AIRCRAFT WAS GROUNDED).