Depends. If the muffler is old and things have rusted, yeah, you should have to pay for that. But if the car only has 10,000 miles on it and the muffler fell off because of poor build quality or flawed design, then no, you shouldn't have to pay. The repair tech who fixes the muffler in this second situation still gets paid - just not by you, but by the manufacturer.
How long since a Dish tech last worked on the dish? Does this dish have recurring alignment problems? If it's been working forever and just now developed a problem after years of use you'll probably have to pay. Or disconnect, and move on to a different service. If you're pretty sure it's an alignment problem, no harm in trying to learn how to align it yourself. If you fail, things are no worse than they were before (hopefully!) and then you can decide to pay someone to come out and fix it.
See post #18. In this instance you chose to lease, not purchase said "vehicle".