To remove the upper component board you will be pulling gently on its cable while lifting it up enough to clear the battery, but not high enough to scrape against the rear case. Go slowly and carefully.

Insert the tip of a spudger under the upper component board to lift it slightly.

Pull the board up and out of the space between the battery and the rear case bezel.

Remove the upper component board.

On reassembly, you'll want to reconnect the GPS antenna cable at this point. Use tweezers and work carefully.