Unscrew the Phillips #00 screw which retains the hard drive in place.
Gently slide the hard drive to the left in order to disengage the SATA connectors.
It may be quite stiff, in which case you can ease the hard drive out of the SATA connectors by inserting a spudger between the hard drive and the connector block.
Remove the 3 Phillips #0 screws from the fan bracket.
Lift the fan up and place it back down above the heatsink.
Do not fully remove the motherboard. As there is hidden cable on the underside that could be damaged.
The heatsink has a strip of adhesive on the underside securing it to the plastic body.
The motherboard can be lifted from the side and and then to the right to free the I/O port from the enclosure. Some force may be required to release the heatsink.
Rotate the motherboard to the right and lay it down so that the copper heatsink is facing up and parallel with the bottom of the monitor.
In this position the last cable to the motherboard can be disconnected using the spudger to push each end out until loose enough to pull the cable completely out.
The motherboard can now be completely removed from the laptop enclosure.