Tie the roast securely with kitchen twine to help hold it’s shape and to make it easy to remove from the pressure cooker when done. Season on both sides with salt and pepper. Brown the roast well on both sides in a non-stick skillet. Place on a rack in a pressure cooker. Add the broth and wine. Following your pressure cooker instructions, cook under pressure for 60 minutes. Let the pressure fall according to your cooker instructions before opening the lid and remove the roast. Cover it with foil to keep it warm and set aside. Strain the liquid and skim excess fat. Pour into a medium saucepan. Bring to a boil and add all of the vegetables, garlic cloves and bay leaf. Lower the heat and simmer until tender (about 15 minutes). In a small skillet melt the butter and add the flour to form a roux. Cook for a minute over medium heat and add to the simmering cooking liquid and vegetables. Bring back to a boil and gently stir until thickened. Add the meat back to the gravy and heat through.