As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL COPILOT ATT FAIL AND HDG FAIL PFD ENUNCIATORS ILLUMINATED WITH CHECK PFD 2 ENUNCIATOR COULD NOT RESET. REMOVED FAULTY AHRS UNIT NR 2 S/N 1110 AND INSTALLED UNIT S/N 2020 REPAIRED BY FAA REPAIR STATION NR M31R0300 SYSTEM OPERATIONAL CHECKS GOOD IAW MM 34-21-01.