What was found
DURING CRUISE, FL 330 WITH ENG ANTI-ICE ON, RECEIVED A RT ENGINE BLEED VALVE CAUTION AND LIGHT. SECURED THE RT ENGINE BLEED VALVE IAW QRH PROCEDURES. APPROX 5 MINUTES LATER, RECEIVED A LT ENGINE BLEED VALVE CAUTION AND LIGHT AGAIN. COMPLIED WITH QRH PROCEDURES. R & R THE LT AND RT FAN AIR MODULATING VALVES IAW AMM 36-11-16. OPS AND LEAK CHECKED GOOD. R & R LT AND RT FAN AIR TEMPERATURE SENSOR IAW AMM 36-11-17. OPS AND LEAK CHECKED GOOD. ACCOMPLISHED GROUND ENGINE RUN. ALL DUCT PRESSURES WITHIN NORMAL RANGE. OK TO CONTINUE SERVICE.