As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2010 ADI ROLL MISMATCH MESSAGE DURING TAXI. CAPTAINS EADI SHOWED INCREASING RIGHT WING DOWN. SYNCED TO WINGS LEVEL USING VG ERECT AND ALMOST IMMEDIATELY RECEIVED MESSAGE AGAIN. MAINTENACE REPLACED NR 1 AHRS IAW MTC 9340019. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.