As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ROTOR TACH INTERMITTENT. TEST FLIGHT EVAL FOUND ROTOR TACH AND DIGITAL READOUT INTERMITTENT ON THE GROUND BUT WORKS FINE IN FLIGHT. THE ROTOR INDICATION DECREASES AND RETURNS TO NORMAL WHEN THE COLLECTIVE IS APPLIED ON THE GROUND. REMOVED AND REPLACED SPEED PICK-UP SENSOR. MOC COMPLETED, NO FAULTS NOTED.