As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI FLIGHT NR 2198 - THE YAW DAMPNER WILL NOT ENGAGE IN BOTH LEFT AND RIGHT SIDES. MAINTENCE PERFORMED AFCS OPERATIONAL GROUND POWER UP TEST IAW DHC-8-200 MM TASK 22-10-00-710-802. TESTED GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.