As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3347 CREW REPORTED AFTER TAKEOFF BOTH TUBES EADI, EHSI BLANKED OUT SEVERAL TIMES, PITCH AND ROLL AMBER INDICATIONS, ADI SHOWED +40 DEGREES NOSE UP AND 5 DEGREE ROLL TO THE LEFT. CREW RETURNED TO THE FIELD AND TAXI SAFELY TO THE GATE. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NR 1 AHRS. OPERATIONAL CHECK GOOD AT THIS TIME WHILE ON GROUND PER SAAB AMM 34-21-00. AIRCRAFT RETURNED TO SERVICE.