As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE BACK TO BASE FUEL ODOR DETECTED IN CABIN PERFORMED PRECAUTIONARY LANDING AT KEDU. PERFORMED INSPECTION OF FUEL SYSTEM AND ENGINE FUEL SYSTEMS, ACCOMPLISHED GROUND RUNS WITH NO LEAKS OR FUEL ODORS DETECTED. FUNCTIONAL CHECK FLIGHT WAS CONDUCTED NO FURTHER ODORS DETECTED. HELICOPTER HAS FLOWN 2.8 HOURS SINCE INITIAL EVENT WITHOUT FURTHER ISSUES.