Put diced bell peppers, onion, corn & black bean salsa in crock pot. Top with Roast. Add taco seasoning & cumin. Add all 3 kinds of beer. Cook on low for 8 hours.
Take roast out and shred. Drain broth saving pepper mix to add to shredded roast. Boil broth until reduced down to 3 cups. Add to roast. Add diced tomatoes with green chilies and can of green chilies. Let roast set with broth mix for at least 1/2 hour.
Set out one tortilla. Top with one slice of cheese. Add about 3 tablespoons roast mix and roll up. Do same with all tortilas. Top with one of cheese. Bake or Microwave until cheese melts and tortilla is warm. I add salsa verde & sour cream.