As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS ANTI-ICE R ON TAKEOFF ROLL WITH ENG ANTI-ICE SELECTED TO ON. AIRCRAFT RETURNED TO BLOCKS. *S/D* MAINTENANCE FOUND EAI (ENGINE ANTI- ICE) VALVE MUSCLE LINE (59T473) B-NUT DISCONNECTED AT 6:00 POSITION. SECURE SAME. ALSO REPLACED PRESSURE SENSOR AS PRECAUTIONARY. PERFORMED HIGH POWER ENGINE RUN CHECK. ALL EAI VALVE INDICATIONS NOW NORMAL.