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In a large skillet, melt butter over medium-high heat. Add mushrooms, onion, sweet pepper, 1/2 teaspoon salt and 1/2 teaspoon pepper; cook and stir until tender, 6-8 minutes. Add garlic; cook 1 minute longer. Stir in flour until blended. Gradually whisk in broth. Bring to a boil, stirring constantly; cook and stir until thickened, 1-2 minutes.
Transfer to a 5-qt. slow cooker. Stir in cream and noodles. Cook, covered, on low until noodles are tender, 4-5 hours. Meanwhile, in a small bowl, combine tuna, lemon juice and remaining salt and pepper.