What was found
SLC FLIGHT NR 2452: ABORTED TAKEOFF DUE TO IAS MISMATCH AT 70 TO 80 KTS, FO AIRSPEED WAS LAGGING UP TO 30 TO 40 KTS. MAINENANCE INSPECTED RT PRIMARY PITOT/STATIC PROBE IAW Q400 AMM TASK 34-11-06-280-801. FOUND THE DRAIN HOLE TO BE PLUGGED. CLEANED DRAIN HOLE AND THEN COMPLIED WITH TASK 34-11-06-680-801 FOR WATER ACCUMULATION PURGE. RAN UP BOTH NR 1 AND NR 2 AIRSPEED FROM 30-250 KTS. NO DEFECTS NOTED. C/W HORZION MTC 6341102 FOR NR 2 PITOT AND NR 2 STATIC. ALL CHECKS GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.