dc250 error code 042-326

Hi
I am getting this error code 042-326 on my xerox dc250 can anyone help?

I have tried holding down the 0 key for 5 secs then pressing enter, then entering 6789 and reset NVM location 741-105 to 0
it has now went onto the screen with copy, scan and stored progames, with copy and scan blanked out
When searching online it says that this error code is the transfer belt, ours was only replaced before xmas

 

There is a small silver color sensor on the back side of the transfer belt on top side you will see it while moving the belt with hand slowly there is a black spot on top its the sensor, which needs to be cleaned with a wet tissue paper and then reset the code