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 MULTIPLE AREAS OF CORROSION BETWEEN STA 727I+8" TO STA 847. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS IAW B737-900SRM 53-00-53-1A-2, REMOVED AND REPLACED TRANSISTION PANEL B737-900 53-00-53-2R-2W:1.0 O:.040 R:.034 L:6.00 D:.006.