2008 Sirius Factory Radio - Not All Channels

[dbbent]

Second owner of 2008 PT with factory am/fm/cd/Sirius. For the first year, all Sirius channels worked fine. When I changed the plan to the just a few select channels, that is NASCAR, Comedy, it worked fine but I couldn't receive all the channels I was supposed to. Sirius radio tried everything, still could not receive a few of the channels. Now all I get is Channel 184 and 90. Disconnected battery for one hour, but pre-sets stayed the same. Sirius has given up and says it must be the radio. Any suggestions before I take it to the dealer?

Regular AM/FM and Cd works fine/

Dave