As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT FLEW UNEVENTFUL. UPON TAKEOFF, THE CREW SELECTED GEAR UP. THE NOSE AND RT MAIN GEAR BEGAN TO RETRACT. THE LT MAIN GEAR REMAINED DOWN AND LOCKED. CREW SELECTED GEAR DOWN AND RETURNED TO 3 GREEN. ONCE AGAIN, CREW SELECTED GEAR UP. GEAR DID NOT MOVE. CREW LANDED. AIRCRAFT THEN FERRIED BACK. TROUBLESHOOTING DETERMINED POWERPACK PRESSURE SWITCH HAD FAILED OPEN. SWITCH REPLACED, LANDING GEAR FUNCTION CHECKED NORMAL.