What was found
ON TAKEOFF, AFTER BOTH ENGINES WERE STABILIZED AT 40%, TAKEOFF POWER APPLIED AND AIRCRAFT DRIFTED TO THE RIGHT NEARLY OFF THE RUNWAY. RETURNED TO THE GATE. ACCOMPLISHED #2 ENGINE IS SLOW TO ACCELERATE FAULT ISOLATION PER FRMFIM 73-05-00-810-814-F00. DRAINED #2 ENGINE PS3 LINE. FOUND SMALL QUANTITY OF WATER. REPLACED THE NR 2 ENGINE BLEED AIR CHECK VALVE PER AMM 36-11-02 WHICH WAS FOUND TO BE IN SERVICEABLE CONDITION. ACCOMPLISHED ACCELERATION CHECK TEST 8 PER AMM 71-00-00-700-824-F00. OPERATIONAL CHECK GOOD. AIRCRAFT WAS GROUNDED.