Thanks for the guide. I had an issue where the lights would switch on but the roller would not spin. After taking it apart I found the issue. When putting the cover on the plastic tab that needs to engage the roller switch slides behind the ‘button’ for the switch.
hard to explain but if you take off the side where the motherboard is you will see the green micro switch follow the spring loaded button to the front of the unit. The plastic tab on the cover slides in besides it causing it not to engage the switch