As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) JUST AFTER TAKEOFF, THE CREW RECEIVED RED FLAGS FOR THE CAPTAINS AIRSPEED, ALTIMETER AND VSI MOMENTARILY. INDICATIONS RETURNED TO NORMAL SHORTLY AFTER. THE FLIGHT RETURNED TO THE DEPARTURE AIRFIELD AND LANDED WITHOUT FURTHER INCIDENT. MX R&R THE NR 1 ADC AND OPS CHECKED SERVICEABLE. ACFT RETURNED TO SERVICE.