As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THAT AIRCRAFT YAWED IN CRUISE FLIGHT AND THE ROTOR RPM DROPPED AND RECOVERED TO 96 PERCENT. RETURNED TO OFFSHORE PLATFORM WITH 96 PERCENT ROTOR RPM. AFTER LANDING AND EXERCISING COLLECTIVE, THE ROTOR RPM RETURNED TO 100 PERCENT. MAINTENANCE C/W A PRESSURE AND VACUUM FUEL SYSTEM CHECK. COULD NOT FIND ANY PROBLEMS. REPLACED FUEL CONTROL, GOVERNOR, AND FUEL NOZZLE FOR PRECAUTION.