As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL ADC OUTPUTS ON THE COPILOTS PFD (ALTIMETER, VSI AND AIRSPEED, ECT) FLAGGED IN FLIGHT INTERMITTENTLY AND WOULD RESET ITSELF. CREW REQUESTED TO LEAVE RVSM AIRSPACE. THE ADC WAS FOUND TO BE DEFECTIVE AND WAS REPLACED. THE SYSTEM WAS TESTED AND INSPECTED IAW MM AND FOUND TO COMPLY WITH FAR 91.411 PART 43 AND MFG RVSM ADC INSPECTIONS. THE AIRCRAFT REMAINS RVSM COMPLIANT. (K)