As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A TRAINING FLIGHT, PILOTS RETRACTED THE LANDING GEAR. A BANG WAS HEARD. THE RIGHT GEAR STAYED DOWN AND LOCKED WHILE THE NOSE GEAR AND LEFT MAIN GEAR RETRACTED NORMALY. PILOTS EXTENDED THE NOSE AND LEFT MAIN GEAR USING THE EMERGENCY SYSTEM. A NORMAL LANDING WAS ACCOMPLISHED. INSPECTION REVEALED THE RIGHT GEAR ACTUATOR HAS FAILED INTERNALLY.