As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ON RETURN FLIGHT WITH PATIENT ONBOARD. CREW NOTICED UNUSUAL ODOR AND LIGHT HAZE OF SMOKE IN CABIN/COCKPIT. PILOT PERFORMED PRECAUTIONARY LANDING WITHOUT INCIDENT. UPON MAINTENANCE ARRIVAL, MECHANIC FOUND AIR PUMP CIRCUIT BREAKER TRIPPED. LOCATED AIR PUMP AND CONFIRMED PUMP HAD FAILED INTERNALLY. REPLACED WITH NEW. MANUFACTURER HAS NO PM SCHEDULE.