error message Maintenance kit is missing, but it is not
Product Name: xerox phaser 8560
Operating System: Windows 10 x64
having reinstalled my old MFP8560 it printed okay first, then started with "replace garbage drawer" without any need and now "maintenance kit is missing", even though I tried three available maintence kits to no avail. I heard about sensors that might need cleaning, where would that be? What would be the best way to go?
Thanks for thinking along, hoping to print again soon,