This step requires the removal of the warranty sticker. Removing the sticker will void the warranty. According to the FTC removing this will not void your warranty.
Locate the sticker in the battery compartment labeled: "En: Warranty Void if Seal Damaged."
Remove the sticker using the PSP Opening Tools.
Under the sticker is a 5mm Phillips screw needed in the next step.
Two ribbon cables -- flip up latch and remove horizontally.
One wire clamp -- use an opening tool to pry it up vertically.
One wiring harness -- use your fingers, a PSP opening tool, or tweezers to disconnect the connector horizontally.
The ribbon cable near the wire clamp has a brown tab that should be lifted using an opening tool prior to removal. Be careful to not damage the ribbon or connector.