As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN ROUTE TO SENDING FACILITY FOR PATIENT PICKUP. 5 MILES NORTH OF THE FACILITY ENTIRE CREW COULD SMELL WHAT SEEMED LIKE ELECTRICAL BURNING FUMES IN THE BACK AND FRONT OF THE AIRCRAFT. THERE WAS NO APPARENT SMOKE. NO CIRCUIT BREAKERS POPPED. AMPS AND VOLTS LOOKED NORMAL AND NO CAUTION LIGHTS. ABORTED FLIGHT UNTIL CAUSE COULD BE DETERMINED AND FIXED.