As I am not aware of any maple that should have yellow leaves this time of year, you obviously have a major problem. This isn't anything we can diagnose from afar. I would suggest you have a certified arborist make an on-site visit to check for encircling roots, various fungi, disease, insects or other problems. You can find one by visiting this web site and clicking on Find An Arborist. You can put in your zip code.  http://www.treesaregood.org/