As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PIT DOOR SUROUND LOWER SILL WEB CORRODED MILTIPLE AREAS BETWEEN STA 787 TO STA 847. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-60-15-1A-1. REMOVED AND REPLACED SILL WEB IAW 737-900ER SRM 51-40-02-0G-0.W= 2" O= .050 R= .041 L= 4" D= .009.