Middle ballast switch not working properly

[costanza]

Hi there

I have a 2014 Mojo 2.5 and this year I noticed my centre bag only seems to fill. Randomly it will empty when starting and stopping the flow some times. Both lights come on regardless whether selecting fill or empty. May have been replaced by dealer over winter since I was missing switch cover for it and was replaced when I got boat back. Any idea what to check to fix it? How do you pop whole thing out to see if wiring has come loose? What’s the right schematics for wiring for it? Thanks for any advice !