Heat oil in the cooker. Cook the onion until just beginning to soften - 2 minutes or so. Add the garlic and continue to cook another 30 seconds. Add the remaining veggies, dry spices, reserved beans and boiling water. Lock the lid in place.
Bring up to high pressure. Reduce heat until just enough to maintain pressure. Cook at high pressure for 5 minutes. Turn off heat and allow pressure to reduce naturally.
Remove bay leaf. Stir in tomato paste and pasta. Continue cooking over medium high heat (not under pressure) for 7 minutes, or until pasta is cooked.Stir in the vinegar. Top each serving with a sprinkle of nutritional yeast.