As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO COMPARTMENT DOOR SILL WEB CORRODED. GROUNDED-YES. REMOVED DAMAGE ON AFT CARGO DOOR SILL WEB ORIGINAL THICKNESS 0.050, MATERIAL REMAINING 0.032. REMOVED 0.018 AND FOUND TO BE OUT OF LIMITS, PER B737-900ER SRM 53-60-15-1A-1. REMOVED AND REPLACED WEB, PER BAC DWG146AB340 AND BAC 737-900ER SRM 51-40-02.