As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT PTI L/H FWD TRANSITION HAS MULTIPLE AREAS OF CORROSION. GROUNDED - YES. REMOVED CORROSION AND CHECKED LIMITS FOUND TRANSITION PANEL TO BE OUT OF LIMITS AIW B737-900ER SRM 53-00-53-1A-2. REPAIRED TRANSITION PANEL IAW B737-900ER SRM 53-00-53-2R-5W .5 O .040 R .032 L 1.2 D .008.