Ok we've changed the item but still having the same ewrro
so I'm guessing it's something else
then we had a paper jam and there is a loud griding sound from teh back of the printer after we remove the paper
when you close the front door you hear the loud noise
For 03-318 error maybe it will be better to have a tech to reinstall the machine software and if this not solve the issue it could be the IIT (scanner) PWB defective.
And for the grinding noise it could be from the 2nd BTR.