As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DOOR SURROUND LOWER SILL WEB CORRODED BETWEEN STA 807 TO STA 847. GROUNDED - YES. REMOVED AND REPLACED AFT CARGO DOOR SURROND LOWER SILL WED IAW B737-900 SRM 51-40-02-0G-0 REMOVED CORROSION FOUND TO BE OUT OF LIMITS IAW BOEING 737-900 SRM 53-60-15-1A-1W= 1" O= .050 R= .033 L= 5" D= .017.