As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 AHRS FAILED ON CLIMBOUT. HSI/HDG MESSAGE AND ADI PITCH MISMATCH ON 800 PANEL. AFTER MAINTENANCE REMOVED AND REPLACED NR 1 AHRS F/O NOTICED HDG MISMATCH ON F/O SIDE. MAINT WAITING FOR PUSH BACK TO TAXI AIRCRAFT FOR HDG MISMATCH. MAINT TAXIED AIRCRAFT, OPS NORMAL.