As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON A DUAL TRAINING FLIGHT, STUDENT AND INSTRUCTOR HEARD A NOISE WHEN LANDING GEAR WAS RETRACTED. LT LANDING GEAR REMAINED IN A PARTIALLY RETRACTED/ EXTENDED POSITION, UNABLE TO ACTUATE UP OR DOWN. THE LT LANDING GEAR ACTUATOR BODY HAD FAILED (CRACKED) AT THE FWD MOUNTING BOLT HOLE, ALLOWING THE ACTUATOR BORE TO OPEN ENOUGH SO THAT PISTON WOULD NOT ENGAGE THE LANDING GEAR PIVOT SECTOR GEAR SUFFICIENTLY TO MOVE THE LANDING GEAR. (K)