What was found
AROUND 85 KTS BLEED HOT 1 AND 2 CAME ON. TEMP KNOB WAS 3 O'CLOCK. BLEED FLOW MIN FOR ENTIRE TAXI. DID E/A RESET BLEED NOT NR 1 AND NR 2 BOTH WENT OUT. ABORTED TAKE OFF. REMOVED FROM SERVICE. INTERROGATED CDS, FAULTS FOUND IN CURRENT LEG: 1007-R, 1006-R, NH NAPRSOV. REMOVED AND REPLACED RT ENGINE NACELLE SHUTOFF VALVE, IAW Q400 MM 36-11-19-00-801 AND 36-11-19-400-801. C/W OPERATIONAL TEST OF BLEED SYSTEM, IAW Q400 AMM 36-11-00-710-802. OPERATIONS CHECK GOOD. FAULTS DID NOT RETURN. OPERATED BOTH ENGINES AT NTOP FOR A TIMEFRAME OF THREE MINUTES, NO DEFECTS/FAULTS FOUND. AIRCRAFT RETURNED TO SERVICE.