As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AVCS FAIL LIGHT ILLUMINATED IN FLIGHT. THE PILOT ABORTED THE FLIGHT ENROUTE TO THE SENDING HOSPITAL & RETURNED TO BASE. COMPLIED WITH THE PROCEDURE IN THE RFM & THE SYS RETURNED TO NORMAL OPERATION. UPON LANDING, THE MECHANIC REINITIALIZED THE AVCS SYS IAW THE MM, THEN RETURNED ACFT TO SERVICE.