Carefully lift the logic board assembly from the left side and work it out of the upper case, minding the port side that may get caught during removal.

Do not entirely remove the logic board yet!

Ensure that the logic board is free from all connections to the upper case (except the battery connector) before proceeding.

During reassembly, ensure all connectors and cables are not placed underneath the logic board. Some of the ribbon cables are very thin and fragile.