What was found
AFT CARGO RT TRNASITION PANEL HAS MANY SPOTS OF CORROSION AT BS 727G+12 TO 727I+6. GROUNDED - YES. REMOVED CORROSION FROM AFT CARGO RT TRANSITION PANEL BS 727G+12 - 727I+6 IAW SRM 53-00-53-1A-2, ORIG MAT WAS .040" IAW SRM 53-60-53-01-2, REMOVED .008", REMAINING IS .032" FOUND TO BE OUT OF LIMITS IAW B737-MAX9 SRM 53-00-53-1A-2. REPAIRED THE AFT CARGO RT TRANSITION PANEL, STA 727G+12 TO 727I+6 IAW SRM 53-00-53-2R-5.