What was found
FOLLOWUP TO HISTORY OF APU OVERSPEED LIGHT AND SHUTDOWN. ETOPS SIGNIFICANT SYSTEM TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION, CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT START CAPABILITY, MEL 49- 99A IS REQUIRED PRIOR TO FLIGHT. GROUNDED - YES. VERIFIED FAULT 49-31-014 IN HISTORY ON CDU DATED MAY 6TH - APU OVERSPEED. ALSO VERIFIED FAULTS IN MAINT HISTORY ON CDU 49-61259 "SPEED SENSOR 1 SHOWS OPEN CIRCUIT" & 49-61261 "SPEED SENSOR 1 SHOWS CIRCUIT FAILURE'. PER B737-900 FIM 49-30 TASK 802 & 49-60 TASK 817 REPLACED SPEED SENSOR REF B737-900 AMM 49-61-21/401. OPS & LEAK CHECK OK.