What was found
AFT PIT LEFT SIDE TRANSITION PANEL UPPER AND LOWER SURFACE HAS CORROSION NUMEROUS PLACE BETWEEN BS727 AND BS727I+10 STR26L AS MARK. GROUNDED - YES. EVALUATED AFT PIT L/H SIDE TRANSITION PNL @ STA BS727 AND 727I+10 STR26R. ORIGINAL MAT .040" MATERIAL REMOVED .006" AND MATERIAL REMAINING .034" FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 53-00-53-1A-2. REMOVED, LOCATED, FABRICATED AND DRILLED ALL NEW REPAIR PARTS IAW B737-900 SRM 53-00-53-2R-5. ALODINED, PRIMED ALL REPAIR PARTS IAW B737-900 SRM 53-00-53-2R-5. INSTALLED ALL REPAIR PARTS, NEW ZEE CHANNELS ON AFT PIT L/H @ STA727-7271I+10 STR26L AND APPLIED CIC IAW B737-900 SRM 53-00-13-2R-5.