As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO TRANSITION AT RBL-21 CORRODED MULTIPLE AREAS BETWEEN STA 727I+8 TO STA 767. GROUNDED - YES. REPAIRED AFT CARGO TRANSITION AT RBL-21 BETWEEN STA 727I+8 TOS STA 767 IAW B737-900 SRM 53-00-53-2R-5 CORROSION FOUND TO BE OUT OF LIMITS IAW B737-900 SRM 53-00-53-1A-2W= 1.4" O= .040 R= .033 L= 14" D= .007.