As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO LOWER SILL WEB HAS CORROSION AT STA 787-847. GROUNDED - YES. REMOVED CORROSION FROM AFT CARGO DOOR LOWER SILL WEB AND WEB WAS FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-60-15-1A-1. REMOVED AND REPLACED WITH NEW LOWER SILLWEB IAW B737-800 SRM 51-40-02-0G-0.W= 1" O= .045 R= .040 L= 1" D= .005.