As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO TRANSITION PANEL RBL-21 HAS MULTIPLE AREAS OF CORROSION BETWEN STA 727I+10 TO STA 767. GROUNDED - YES. REMOVED DAMAGE, FOUND TO BE OUT OF LIMITS REPAIRED IAW B737-900ER SRM 53-70-53-01-2 AND 53-00-53-2R-5W 1" O 0.040" R 0.025" L 1" D 0.015".