I had to think about that, because mine hasn't worked since we bought our TT either.
I came up with the conclusion that I would recommend you do what I did: nothing!
Seriously, the two options I see would be leave it as is, or starting tracing the problem(s), and running them down.
Start with "does it power up" Mine does do that, meaning the lights come on in all the meters. If it doesn't, then find out why: blown fuse, cut, or shorted lead, and so on.
I suppose I don't much care about the monitor panel since it is quite a way down my list of things to to to my TT.
If it's to be, it's up to me.