There's a small release clip on the disc slot cover on the lower part of the REC radio. You can get it off with your fingernail if you have enough fingernail length, otherwise use a small flat screw driver or similar device. This allows access to the navigation dvd for removal/upgrade if you want to give it a try.
There are several companies online that do REC radio repairs for nominal fees. In my personal opinion, even some of the best brand new aftermarket radios don't hold a candle to even the REC. I just put in a $900 unit with all imaginable features in my second car, and as an overall package, I absolutely hate the thing and vastly prefer my Jeep's unit. I'm also not sure how well aftermarket decks interface with the Boston sound system.
You may look into upgrading to the MyGig system if you want additional functionality with factory integration.
2007 Red Rock Crystal Pearl Overland
- 2" Daystar lift - 245/75/17 Revo 2s - 1.5" Spidertrax Spacers -