I have 5 Vibes in a fleet for a courier service. They've been great, by and large. Recently, one of the stock amps blew out. I don't want to put in an after-market amp, as I have no need or interest in "upgrading," but I do want the stereo to work for my driver. Is there any way to bypass the amp? If not, does anyone know where I can find a stock Delphi amp for a 2004 vibe?Thanks!