As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, FLIGHT ATTEMPTED TO RAISE THE LANDING GEAR, BUT THE GEAR WOULD NOT RETRACT. RETURNED TO DEPARTURE. FOUND LANDING GEAR CONTROL CIRCUIT BREAKER NOT SET. RESET CIRCUIT BREAKER AND INSPECTED ALL LANDING GEAR COMPONENTS. NO DEFECTS WERE NOTED. JACKED AC AND PERFORMED 5 RETRACTION AND EXTENSION CYCLES WITH NO DEFECTS NOTED. (K)