Hello to everybody, would be grateful if someone could advise how to get rid of lateral lines which we have been experiencing on our KBA rapida 104-5 on all 5 units. Surprisingly all units print the lines exactly at the same place, we changed the main motor bearings which did not help, we then changed the main flywheel bearings which also did not help. The lines show up when printing solids and dont show in halftones. All rollers are new. All help and advice is welcome. Thank you.