As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HELICOPTER WAS ON A MISSION TO DO SOME SLINGING. WHILE THE ACFT WAS IN CRUISE IT WAS NOTED THAT THERE WAS AN FUEL ODOR IN THE CAB. THE HELICOPTER LANDED AS SOON AS PRACTICAL. ENGINEER DISCOVERED THAT THE FUEL/OIL COOLER OR FUEL/OIL HEAT EXCHANGER WAS LEAKING FUEL FROM THE NR 1 ENGINE. THE FUEL/OIL COOLER WAS REPLACED WITH A SERVICEABLE UNIT.