What was found
LEVEL 1 ANTI-ICE SENSOR FAILED ONE AND A HALF HOURS INTO FLIGHT AT FL 370. NR 1 INTERMEDIATE PRESSURE SENSORS PI1 & PI1B ARE FAULTED & READINGS ARE OUT IN PSC 1 & 2 SENSOR READOUTS. PRESSURE TESTED PI LINES & FOUND B-NUT LOOSE AT UNION BETWEEN PRESSURE PILOT VALVE & PRV PRESSURE CLOSED SWITCH. TIGHTENED NUT, LEAK CHECKED GOOD. TROUBLESHOT IAW FIM 30-12-03-00 & 36-11-01, NO DEFECTS NOTED. R & R BOTH PI SENSORS IAW AMM 36-11-05-4. FOUND PM SENSORS CONTAMINATED WITH WATER. BLEW OUT LINES & FOR PRECAUTIONARY CHANGED BOTH PM SENSORS.