As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER DEPARTING THE CREW OBSERVED NR 1 ADC, NR 1 ENGINE ANTI-ICE AND NR 1 PROP DEICE FAULTS. THE AIRCRAFT RETURNED TO POINT OF DEPARTURE WITHOUT INCIDENT. MAINTENANCE TROUBLE SHOOTING WAS UNABLE TO DUPLICATE THE FAULT. AFTER SATISFACTORY OPERATIONAL TESTING OF THE AFFECTED SYSTEMS THE AIRCRAFT WAS RETURNED TO SERVICE. (TC NR 20060914001)