What was found
FORWARD CARGO COMPARTMENT - RIGHT FLOORBOARD TO SIDEWALL TRANSITION PLATE - FRAME STA. 500C THRU 500F - 500G THRU 500K - MULTIPLE AREAS OF SURFACE CORROSION AROUND FASTENER HOLES. GROUNDED - YES. REMOVED CORROSION @ STA 500C - 500D+11. ORIGINAL THICKNESS = .040" REMOVED = .008" REMAINING =.032" FOUND TO BE OUT OF LIMITS IAW B737-900ER SRM 51-10-02 & 53-00-53-1A-2. REMOVED DAMAGE, FABRICATED, LOCATED, DRILLED AND INSTALLED REPAIR PART IAW B737-900ER SRM 53-00-53-2R-5, SRM 51-40-05, AMM 51-21-41, AND AMM 51-21-72.