As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, NR 2 AHRS DISPLAYED PITCH AND ROLL MISMATCH WITH AHRS DATA INVALID ON 802 PANEL. ADI ROLLED 60 DEGREES AND PITCHED 60 DEGREES UP AND DOWN. R & R NR 2 AHRS IAW 34-20-01. OPS CHECKED GOOD. OK FOR SERVICE. R & R F/O ADI IAW 34-27-01. OPS CHECKED GOOD. OK FOR SERVICE.