OK I tried mine out on the vibrato channel with vibrato on and it makes a "phut, phut, phut" noise for want of a better description. The noise varies in speed along with the vibrato rate. It does it whether or not a guitar is plugged in and I turned all the lights and computers off in the house - in case it is dimmers etc.
I've got three months warranty left (we only get 12 months here).
I'm not sure whether to take it in and ask for it to be fixed or let it go - since I normally don't use it. Still it should work properly and if I go to sell it it's not really much of a selling point is it?
Does Fender know about this problem - can they actually fix it if I bothered to take it in under warranty - or am I wasting my breath.