As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO COMPARTMENT FLOOR SUPPORT TRANSITION PANEL CORRODED FROM BS 727 BS 787 LBL 21. GROUNDED-YES. REMOVED DAMAGE ON AFT CARGO LT TRANSITION PANEL ORIGINAL THICKNESS 0.040, MATERIAL REMAINING 0.028. REMOVED 0.012 AND FOUND TO BE OUT OF LIMITS, PER B737-900ER SRM 53-00-53-1A-2. REPAIRED SECTION OF TRANSITION PANEL FROM BS 727B+8-BS787+14, PER B737-900ER SRM 53-00-53-2R-5.