As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PIT R/H TRANSITION HAS MULTIPLE AREAS OF CORROSION BETWEEN STA 727I TO STA 767. GROUNDED - YES. REMOVED CORROSION FOUND TO BE OUT OF LIMITS AIW B737-900 SRM 53-70-53-1A-2 REPAIRED TRANSITION IAW B737-900 SRM 53-00-53-2R-5W=1.20 O=.040 R=.018 L=12.25 D=.022.