As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT FAILURE - AFCS YAW CAUTION LIGHT ILLUMINATED AFTER AFCS TEST AND WHEN AP IS SELECTED ON THE FLIGHT DIRECTOR, LIGHT EXTINGUISHES WHEN F.D. IS PLACED IN SCAS. (FAILURE CODE 1605). REPLACED PER BRIAN JENKINS BHT PRODUCT SUPPORT.