As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YIP - LANDING GEAR WOULD NOT RETRACT AFTER TAKEOFF FROM YIP. AIRCRAFT RETURNED TO YIP AND MADE AN UNSCHEDULED LANDING. NO EMERGENCY PROCEDURES REQUIRED. PROBLEM WAS DUPLICATED. REPLACED THE NOSE LANDING GEAR SQUAWT SWITCH. LANDING GEAR WAS CYCLED AND OPERATIONALLY CHECK PER FALCON MM 32-60-10 WITH NO DEFECTS NOTED. (M)