As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2506 ON TAKEOFF, DOWNLOCK OVERRIDE REQUIRED TO RETRACT GEAR. RECEIVED A GEAR DISAGREE MESSAGE AND GEAR DID NOT RETRACT. RECEIVED A PROX SYSTEM 1 FAULT. RETURNED TO THE FIELD AND ACCOMPLISHED A UNEVENTFUL LANDING. MAINTENANCE ADJUSTED THE MAIN GEAR PROX SENSORS FOR THE LEFT GEAR IAW 32-61-05-820-803-A01. CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.