As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2423: GEAR WOULD NOT RETRACT AFTER DEPARTURE. 3 GREEN 3 RED HANDLE LIGHT ALL ILLUMINATED WITH HANDLE UP. ALSO, NO WOW LIGHTS. AIRCRAFT RETURNED TO FIELD. MAINTENANCE INSPECTED DOOR AND FOUND WOW NR 2 CENTER HARNESS INOP. REMOVED AND REPLACED WOW/CENTER HARNESS IAW Q400 AMM TASK 32-21-11-400-801. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.