As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB WITH AUTOPILOT SELECTED TO FIRST OFFICER. AUTOPILOT BEGAN UNCOMMANDED AGGRESSIVE PITCH UP. AFTER DISCONNECTING AUTOPILOT, BOTH CAPTAIN & FIRST OFFICER FLIGHT DIRECTORS ERRATIC FOR REMAINDER OF FLIGHT. FLT 5366 REPLACED THE NR 2 AHRS COMPUTER IAW EMB120 AMM. PN 622-6190-204, SN ON 2678 & SN OFF 1570.