As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PIT, AFT SHIELD HAS CORROSION. GROUNDED - YES. REMOVED CORROSION FROM AFT PIT, AFT SHIELD IAW B737-800 SRM 53-60-15-1A-1. ORIG. THICKNESS IS .050" IAW B737-800 SRM 53-60-15-01-1. REMOVED .025" REMAINING THICKNESS IS .025" AND IS FOUND TO BE OUT OF LIMITS IAW B737-800 SRM 53-60-15-1A-1. REPLACED AFT PIT, AFT SHIELD IAW B737-800 SRM 51-40-02 AND B737-800 SRM 51-40-05.