antec TP2 fan problem

[jfall]

I have a 430w Antec Truepower II P/S. It seems that the fan is slightly hitting the grill or something else within the power supply, it's making an annoying ticking sound. If I put a little pressure on the grill the sound stops, but comes back after I let go. Is this a know problem, is there anything I can do to fix it?