As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF ENTERED ICING CONDITIONS, TURNED ON LEFT AND RIGHT COWL ANTI-ICE. LEFT ICING CONDITIONS AND TURNED OFF COWL ANTI-ICE, LEFT COWL ANTI-ICE AMBER CAS MESSAGE APPEARED ON EICAS. REMOVED AND REPLACED PRESSURE RELIEF VALVE ON LEFT ENGINE IAW AMM 30-22-04. OPS CHECK GOOD. (M)