Canon ira7280i image skew

[markchattell]

Looking for advice on a Canon ira7280i the image has a 2mm skew on the lead edge and trail edge but side to side are perfect, this is from all feeds and the complete transfer belt assy, roller assy has been swapped with another, not scanner as is on print outs and all colours are together so rules out reg. Any ideas??

[markchattell]

Just to update the fault was the transfer belt, removed twice and set up.