As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX ON FLIGHT 2197- RETURNED TO FIELD DUE TO ON GEAR RETRACT RIGHT MAIN UNSAFE LIGHT REMAINED ON. ALL THREE GEAR DOOR LIGHTS REMAINED ON. RIGHT MAIN AND NOSE GEAR LIGHT WERE OUT. RECYCLED AS PER CHECKLIST WITH THE SAME RESULTS. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED RIGHT HAND MAIN LANDING GEAR UPLOCK PROXIMITY SENSOR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.