neck pick-up fades in and out bridge is fine

Les Paul Studio plugged into Vox Valvetronix. Neck pick-up fades in and out but bridge pick-up works fine. Please help and advise. Thanks, first time post.

Gibson is earning a bad rep for using some shabby parts as a cost-cutting measure. Check out the selector switch.

Thank you for the response. Any links that you suggest on how to do this? I do not mind trying a simple repair myself, but I am not sure what I'm looking for. Sorry to sound like an idiot but this is new to me and I appreciate you taking the time to respond.

http://www.stewmac.com/cgi-bin/hazel.cgi/hzpi/u/HzSt01100m15120m1412100U0n0n1217131517140n0n/hazel.cgi?client=20740642&action=search&search_field=NB%3BNM%3BWORDS%3BSPECS&SEARCH_COMP=%3A&SEARCH_LOGIC=%2B&SEARCH_MAXHITS=10&SEARCH_SPEC=Selector+Switch

Here's where you can find some switches.