As I noted in my introduction: I may be picking up a 2007 TB Monday. Thing is: One of the broken bits is the radio. Either that of 5-out-of-6 speakers are shot or dying. Which seems more likely? 
Assuming that, as I suspect, it's the radio, and the dealer balks: How much would it cost to replace an XM-capable radio, from where might I best obtain one, and how much effort are they to replace?
Thanks,
Jim

Assuming that, as I suspect, it's the radio, and the dealer balks: How much would it cost to replace an XM-capable radio, from where might I best obtain one, and how much effort are they to replace?
Thanks,
Jim