As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER THE AIRCRAFT TOOK-OFF PILOT SELECTED THE GEAR HANDLE TO THE UP POSITION. DURING CLIMB PILOT REPORT LT MAIN LANDING INDICATION STILL SHOWN GEAR DOWN AND LOCK, PASSENGER HEARD A RUMBLE AROUND LT GEAR AREA. AIRCRAFT RETURN TO YUL MAINTENANCE BASE. MAINTENANCE FOUND A BROKEN WIRE AT THE LT UPLOCK SWITCH. WIRE REPAIRED AS PER MANUFACTURER INSTRUCTION. AIRCRAFT RETURN TO SERVICE.