As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DOOR CUTOUT SILL AREA HAS A FEW SPOTS OF CORROSION. GROUNDED - YES. REMOVED CORROSION . ORIGNAL THICKNESS .045 PER B737-900 SRM 53-60-15. MAT LOSS .008 AT LOWEST, NEW THICKNESS .037 AT LOWEST. AREA OUT OF LIMITS. LOCATED, DRILLED AND INSTALLED P#146A8123-6 PER B737-900 SRM 51-40-02 REF B DWG146A8120 REV A.