As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT WET AREA R2 MOP SILL HAS AREAS OF CORROSION STA 967 TO 1006. GROUNDED - YES. CORROSION FOUND TO BE BEYOND LIMITS IAW B737-900 SRM 53-70-15-1A-1 REMOVED DAMAGED MOP SILL AND INSTALLED NEW MOP SILL IAW B737-900 SRM 51-40-02-0G-0W= 2.0" O= .080" R= .065" L= 10" D= .015".