2007 Chevy Silverado

I leased a full load 2007 Chevy 3500 classic crew dually in jan 2007. Since then it has been into the repair shop on average once a month for so many different reasons that I cannot even list them all. But basically turbo, tranny, rear diff, sunroof leaking, steering components, now the electrical is all going goofy. But in the last 2 months it has needed to go in every week just to keep the truck running. Is there anything that you know about to get me out of the lease without it costing me $20000?