What was found
FLT#301, BUF-JFK. (AIRCRAFT DECLARED AN EMERGENCY AND PERFORMED AN AIR TURN BACK TO BUF) 'L COWL A/ICE FAIL AT 3000' IN FLIGHT; REF TSM BD500-A-J-30-21-00-11AAA-421B-A SEE DEFECT 4140462 (REMOVED AND REPLACED UPPER TAI VALVE PER AMP 30-21-01 LEAK CHK GOOD SEE DEFECT 4140461, ITEM 1(REF TSM BD500-A-J-30-21-00-11AAA-421B-A SEE DEFECT 4140462 AND 4140463 ITEM 1 FOR PARTS CHANGES PERFORMED COWL ANTI ICE OPS CHK PER AMP 71-00-00 OPS CHECK GOOD) FOR OPS CHECK) AND 4140463, ITEM 1 (REMOVED AND REPLACED TAI PRESS TRANSDUCER PER AMP 30-21-21 SEE DEFECT 4140461, ITEM 1 (REF TSM BD500-A-J-30-21-00-11AAA-421B-A SEE DEFECT 4140462 AND 4140463 ITEM 1 FOR PARTS CHANGES PERFORMED COWL ANTI ICE OPS CHK PER AMP 71-00-00 OPS CHECK GOOD) FOR OPS CHECK) FOR PARTS CHANGES PERFORMED COWL ANTI ICE OPS CHECK PER AMP 71-00-00 OPS CHECK GOOD.'