2009 GT w/ Monsoon radio help needed

[MannyL]

I have a 2009 with the Monsoon radio, The aux in jack is having problems on my HU. If I plug a cable in I'm lucky to get one channel. If I apply tension to the plug either pulling it up or pushing down I get both channels but as soon as I release the tension it goes back to no audio or one channel.

Any ideas how to fix this HU? I would go for an aftermarket HU but then I believe I will lose my On Star and I would need a different XM antenna.