My XM radio puck seems to be dead. It died yesterday on my Zumo 550 and I have tried it on my 2730 and it still seems dead. Since I think it might be the USB plug or the cord, I have noticed I can buy just the cover and cord (it looks like it plugs into the puck circuit board) on Ebay and this might fix the problem without buying a whole new puck. Anyone ever just replaced the cover with good results. Thanks for the input.