As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YYJ - AFTER ENGINE SHUT DOWN LEFT MAIN GEAR SAFE LIGHT WENT OUT AND AMBER AND RED GEAR LIGHT CAME ON WITH HANDLE ILLUMINATED. SECONDARY GEAR LIGHTS ALL ARE GREEN. INSTALLED MLG PINS AND ENGAGED NOSE GEAR LOCK. REMOVED AND REPLACED NR 1 DOWN LOCK ACTUATOR PROX SENSOR WITH NEW. OPS CHECK GOOD ACFT OKAY TO CONTINUE SERVICE.