As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE WAY TO PICK UP A PATIENT, IN CRUISE FLIGHT AT NIGHT, THE MEDICAL CREW IN THIS AIR AMBULANCE HELICOPTER DETECTED A BAD SMELL AND THEN SAW SMOKE IN THE AFT CABIN AREA. THE PILOT SHUT DOWN THE ELECTRICAL SYSTEM. AN UNSCHEDULED LANDING WAS MADE INTO A LARGE, WELL LIT, VACANT PARKING LOT AT A LOCAL HIGH SCHOOL. MAINTENANCE DETERMINED SMOKE TO BE FROM STROBE POWER SUPPLY. REPLACED POWER SUPPLY.