As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF THE MEDICAL CREW OF THIS AIR AMBULANCE HELICOPTER REPORTED A STRONG ELECTRICAL SMELL FROM THE REAR OF THE CABIN. THE PILOT RETURNED TO BASE AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE AFT AIR CONDITIONER BLOWER MOTOR WAS INOPERATIVE AND HAD A STRONG ELECTRICAL SMELL. THE MOTOR WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE