What was found
AFT CARGO PIT, STA 767-790 RIGHT HAND TRANSITION HAS MANY AREAS OF SUSPECTED CORROSION ON UPPER AND LOWER SURFACES. GROUNDED - YES. BLENDED AND EVALUATED CORROSION ON AFT CARGO R/H TRANSITION STA 767-790. FOUND DAMAGE NOT TO BE WITHIN LIMITS IAW B737-900ER SRM 53-00-53-1A-2. REMOVED TRANSITION PANEL IAW B737-900ER SRM 51-40-02. RECEIVED PART PN 146A8127412 P.O# 94183101, LOCATED AND DRILLED NEW TRANSITION IAW B767-900ER SRM 53-30-01 AND BOEING DWG# 146A8127. INSTALLED NEW TRANSITION PANEL IAW B737-900ER SRM 51-40-02 AND BOEING DWG# 146A8127. REMOVED AND REINSTALLED INTERCOASTAL TO F.O.M. IAW B737-900ER SRM 51-40-02. (CORROSION FOUND AROUND FASTENER HOLES, DAMAGE NOT PREMITTED PER B737-900 ER SRM 53-00-53).