What was found
CREW REPORTED DURING TAKEOFF ROLL, CAPTAIN'S PFD FLASHED AN AMBER MESSAGE NEAR AIRSPEED TAPE: "IAS". CREW ELECTED TO ABORT TAKEOFF AT AROUND 100 KNOTS. AIRCRAFT RETURNED TO GATE WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND ADC NR 2 PITOT DRAIN FULL OF WATER AND REMOVED WATER CONTAMINATION FROM P2 SYSTEM. MAINTENANCE PERFORMED CHECKS AND REJECTED TAKEOFF INSPECTION. NO DEFECTS NOTED. AIRCRAFT RELEASED FOR SERVICE.