What was found
DURING CLIMB OUT PASSING FL 340, RECEIVED AN ANTI -ICE SENSOR FAIL ALERT. WING, TAIL, & ENGINE ANTI-ICE WAS OFF. TROUBLESHOT IAW FIM 36-11-01 FIGURE 103. ANTI-ICE SENSOR FAIL ALERT DISAPPEARED WHILE FOLLOWING FIM PROCEDURE. ONLY SENSOR SHOWING A FAULT IS PE2 X'D OUT IN PSC-1. ALL OTHER SENSORS APPEAR TO BE WORKING NORMALLY IN PSC-1 & PSC-2. TROUBLESHOT PE2 SENSOR IAW FIM 30-12-03-00 AND WAS HARD FAULTED WITH A HISTORY ALREADY ON MEL. WHILE TROUBLESHOOTING, HAD PE1 SENSOR WITH INTERMITTENT FAULTS, WHEN PE1 FAULTED ANTI-ICE SENSOR FAIL MESSAGE WOULD APPEAR. REPLACED PE1 SENSOR REF 36-11-05-4 NO MESSAGES, PE2 STILL ON MEL. REPLACED PE2 PRIMARY & PE2 BACKUP SENSORS.