I tried all the suggestions(thank you) and have ended up with the following success:
1.Sustain working on EC5 and pedal when I am in full mode,for entire keyboard.
2.Working on upper split only. It cuts off at the split point.

I almost never had used the damper, the way I play,but I have just gotten more into piano and noted the above problems. I don't even know exactly what I did to now get full mode sustain,but it is the most important.Secondly would be a sustained piano on a lower split. I am not even sure I can even do this.

The main thing is that I don't believe anything is very wrong with the Pa4X,just the operator.