P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance. This code is tripped when the open position indicated is > 15% off of desired position.
P1404 - Exhaust Gas Recirculation (EGR) Closed Position Performance . This code is set when the EGR closed position indicated is > 10 counts off desired position.
These two codes are inidcating issues at both ends of the EGR's travel. Since you've checked and cleaned the valve pintle and I assume the intake passage as well, then I would say you have a bad EGR valve.
Normally, if it were an issue with the 5v reference signal, it would only error one way or the other not both.