Observe and record (just take a photo...) which color of motor phase wire is connected to which terminal on the controller board. You will use this information during reassembly.

Disconnect the three motor phase wires (Yellow, Green, and Blue at the left of the photo) by pulling the connector (not the wire) straight up from the board

Disconnect the sensor connector. The connector is held on by an integrated clip, squeeze the lever to release.

Do not pull on electrical wires, they can separate from their connector

No other wires need be disconnected from the controller!