I have a VTL 2.5 pre and the selector switch has been playing up for a while.

It goes from left to right Phono, Aux, Cd and then a couple of others.

When I select one of the first 3 it most of the time plays on the right channel only and I have to gently twiddle it to regain the left channel.

I have opened it up twice and liberally sprayed it with contact cleaner as well as turning it frequently but it doesn't make it better.

Is there anything else I can do? Would WD40 help or have I been googling too much?

I suppose worst case I replace it but not so easy with a US amp.

Any suggestions from the experts on this site much appreciated.

Cheers,