As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKING RUNWAY FOR POSITION & HOLD RECEIVED ICE CONDITION ADVISORY MSG FOLLOWED BY A ICE CONDITION. ANTI-ICE WARNING MSG PRIOR TO TAKEOFF ROLL. AFTER A FEW MINUTES MSG'S WENT AWAY BUT CAME BACK AGAIN, ON TAXI BACK TO GATE. TROUBLESHOOT SYS FOUND NR 1 ICE DETECTOR FAIL. R & R NR 1 ICE DETECTOR IAW AMM 30-80-01. OPERATIONS CHECKED GOOD. NO MSG FOUND IAW AMM 30-80-00.