What was found
ON FLIGHT 2803 THE CREW REPORTED A STRONG AND PUNGENT ODOR IN THE COCKPIT DURING THE TAKEOFF ROLL. THE CREW ELECTED TO MAKE A HIGH SPEED ABORT AROUND 120 KTS. THE AIRCRAFT WAS REMOVED FROM SERVICE. COMPLIED WITH INSP 05-50-16 EMB MM NO DEFECTS NOTED. PERFORMED OPERATIONAL CHECK OF BOTH PACK IAW AMB AMM 21-51-00 WITH APU ON ENG OFF. NUMBER ONE AIR CYCLE MACHINE NEEDED TO BE CHANGED. REMOVED AND REPLACED A PERFECTLY GOOD AIR CYCLE MACHINE AS DIRECTED IAW EMB AMM 21-51-03 AND THE OPERATIONAL CHECK WAS GOOD IAW 21-51-00 AND IAW ETN-EM-72-034. THE AIRCRAFT WAS RETURNED TO SERVICE.