Cut the zip ties holding the bundle of wires together.

Carefully trace the two wires coming out of the pump you are replacing.

The pump wires should connect to a black wire and a white wire.

There may be a diode attached in-line on the red wire.

Disconnect the pump by pulling the wire terminals apart. This may take significant force. Pull at the terminals, not the wires.

If there is an in-line diode, disconnect and remove it. Do not use it with the replacement part.