As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO L/H TRANSITION HAS AREAS OF CORROSION FROM STA 737B TO STA 787. GROUNDED - YES. REMOVED CORROSION FOUND OUT LIMITS IAW B737-800 SRM 53-00-53-1A-2 & REPAIRED TRANSITION IAW B737-800 SRM 5300-53-2R-5W=1" O=.040" R=0" L=130" D=.040".