As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE ANTI-ICE VALVE CYCLING OPEN & CLOSED. SHOULD REMAIN OPEN. EICAS MESSAGES WOULD COME AND GO AS WELL. PUTTING ICE DETECTION KNOB TO ENGINE OR ALL E1 STILL WOULD NOT OPEN ALSO RECIEVED ENG1 ANTI ICE OVERPRESSURE ADVISORY MESSAGE. DURING CYCLING OF ANTI-ICE VALVE. REMOVED AND REPLACED THE ENGINE ANTI-ICE VALVE IAW AMM 30-21-01. LEAK TESTED GOOD. REMOVED AND REPLACED ANTI-ICE TRANSDUCER IAW AMM 30-21-06. LEAK TESTED GOOD. PERFORMED AN ANTI-ICE SYSTEM OPERATIONAL TEST IAW AMM 30-00-00. OPS CHECKED GOOD.