As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AFTER TAKEOFF THE CREW RECEIVED RED FLAGS FOR THE CAPTAIN'S AIRSPEED, ALTIMETER AND VSI MOMENTARILY. INDICATIONS RETURNED TO NORMAL SHORTLY. THE FLIGHT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 ADC IAW 34-13-01. ALL CHECKS NORMAL AT THIS TIME.