As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT FIVE MINUTES INTO A FLIGHT, IN CRUISE FLIGHT, THE PILOT AND CREW NOTED SMOKE AND A STRONG ELECTRICAL SMELL IN THE CABIN AND COCKPIT OF THE HELICOPTER. THEY OPENED WINDOWS TO VENT THE SMOKE, RETURNED TO BASE AND LANDED UNEVENTFULLY. MAINTENANCE DISCOVERED THE AFT CABIN AIR CONDITIONER BLOWER MOTOR HAD OVERHEATED. THE MOTOR WAS REPLACED AND THE HELICOPTER RETURNED TO SERVICE.