As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRSPEED LEFT PFD READING ERRATIC. ON GROUND LEFT PFD READS 25-30 KNOTS. IN HOVER LEFT PFD SWINGS BETWEEN 0 - 40 KNOTS. SCREENS WOULD NOT MATCH. A TEST FLIGHT EVALUATION REVEALED CO-PILOTS AIRSPEED WAS 20-25 KTS ON THE GROUND WITH PILOTS AIRSPEED 10 KTS. AT A HOVER CO-PILOTS AIRSPEED WAS FLUCTUATING FROM 0-30 KTS AND PILOTS WAS STABLE AT 0. IN FLIGHT BOTH CO-PILOTS AND PILOTS AIRSPEED INDICATED CORRECTLY WITH NO FLUCTUATION. REMOVED AND REPLACED ADU IAW EC 145 WP 34-11-00, 4-2.