As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO LWR MAIN SILL OF DOOR OPENING HAS AREAS OF CORROSION. GROUNDED - YES. BLENDED CORROSION, FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-60-15-1A-1. REMOVED AND REPLACED SILL WEB IAW B737-800 SRM 51-40-02-0G-0.W= 1" O= .050" R= .044 L= 2." D= .006".