As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2345: LANDING GEAR FAILED TO RETRACT AFTER TAKEOFF. HANDLE SELECTED UP BUT GEAR REMAINED 3-GREEN. AIRCRAFT RETURNED TO FIELD. MAINTENANCE INTERROGATED PSEU. FOUND NLG CENTERING PROX SENSOR OPEN. REMOVED WOW2 AND CENTERING HARNESS IAW Q400 TASK 32-61-06-000-802 AND REPLACED THE WOW2/CENTERING HARNESS IAW Q400 AMM TASK 32-61-06-400-802. PERFORMED OPS TEST OF EXT/RETRACTION SYSTEM IAW TASK 32-31-00-710-801. OPS TEST GOOD. AIRCRAFT RETURNED TO SERVICE.