Reply to Vci 100 line fader!

Hi! During my last performance the left line fader just stoped working and felt all lose...when i slide it up it turns of the entire unit and if i use a litle more pressure it starts jumping around and as soon as I let it go it just sends a signal as if it is fully down. To make it short its broken! Now I need to replace it. So, please I need to fix this asap couse I got another gig coming on and need to know with what fader?? Does it have to be a original one or can I use a diferent one? THX A LOT!!