What was found
DURING INITIAL TAKEOFF ROLL WITH ENG A/I ON RECEIVED MASTER CAUT ION NO1 ENG COWL ANTI-ICE LOW SPEED REJECTED AT 40-50 KNOTS. THE LIGHT DID EXTINGUISH AFTER TAXIING. REMOVED AND REPLACED ENG #1 ANTI ICE PRESSURE SENSOR IN REF TO AMM 30-21-21 OPS CHECK STILL NEEDS TO BE DONE. REMOVED #1 ENG COWL TAI IN REF TO AMM 30-21-11. NEW VALVE ON ORDER AND INSTALL AND OPS CHECKS STILL REQUIRED. INSTALLED NEW #1 ENGINE COWL TAI VALVE IN REF TO AMM 30-20-11. OPS AND LEAK CHECK STILL NEED TO BE ACCOMPLISHED. PERFORMED ENGINE 1 ENGINE RUN AND ANTI ICE VALVE OPS CHECK IN REF AMM 30-21-11-400-801. OPERATIONAL AND LEAK CHECK NORMAL.