As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RADIO CONTROL HEAD IN THE CREW COMPARTMENT BEGAN VERY RAPIDLY CYCLING SEARCH MODE WHILE DEVELOPING EXCESSIVE HEAT AND FUMES. THE HELICOPTER ABORTED THE REVENUE FLIGHT AND RETURNED TO BASE. MAINTENANCE REPLACED THE FAULTY RADIO CONTROL HEAD AND THE AIRCRAFT WAS RETURNED TO SERVICE.