For the drum unit.
Remove the waste toner box and the two small gray covers behind it.
Remove the screw and connector from the K developer unit and slide the developer unit on out.
On the transfer unit there are two recessed screws which need to be completely loosened:
Remove three screw from the transfer assembly:
Rotate lever counter-clockwise and lock with screw:
Remove three screws and two connectors and slide the drum unit on out:
You do not need to remove the transfer assembly to remove the drum unit.