My ST2 just died. Still picks up all the channels fine but just doesn't output any sound through the 1/8'' minijack. I've only been using it for 5 yrs on my home system, no car, no boom box dock etc. Sirius tech support went though all the steps wt me but concluded it was probably a burned out amp and I needed to buy a new radio. Is there ANYONE that does "unofficial" repairs of these things? I know its gotta be just some stupid little thing that powers the minijack.

This could be because of an amp, or it could just be a bad solder joint. Unfortunately, it's impossible to find an amp to replace it because sirius does not release a schematic. So, most likely it's irreparable.

If you would like to see if it's a bad solder, just leave it near a heater and plug it in. If it works, that should tell you that you should reflow your radio. Reflowing is easy, just remove the circuit board from the plastics and heat it up to 800-1000 degrees F with a heat gun. Let it cool and reassemble.

I had the Jack start to go. I had a similar problem with the 12v dc power in Jack that was fixed with a bit of solder. I attempted this on the output Jack and had small success. I happened to have an non activated ST2 unit in better shape. Since mine has a lifetime script and I love the unit for many reasons I tried something that appears to have worked.
Inside the case there are 2 circuit cards. One is the receiver (UMA-ST2R). It has the antenna Jack. This was still working. The radio card (UPA-ST2) had the worn jacks also the display and buttons etc.
I swapped the receiver card (lower one in pic) and all worked when I plugged it in and that was it. All channels in a newer case and radio. Four screws on the case and three on the card. Find one on eBay and a small Philips screw driver and problems should go away.

I fixed my on ebay. http://www.ebay.com/itm/400186953938