Press Sauté. Cook the bacon in the inner pot until crisp. When finished, place the bacon on a paper towel-lined plate and set aside.
Add the potatoes, leeks, water, salt and pepper to the inner pot and mix well.
Secure the lid and move the pressure release valve to the Sealing position. Press Manual or Pressure Cook. Cook on High for 5 minutes.
When cooking is complete, press Cancel, then quick-release the pressure.
Press Sauté. Add 1/2 cup of milk and the cubed butter to pot. Cook and stir for 1 minute, mashing the potatoes until still slightly chunky. Add the remaining 1/2 cup milk and the cabbage. Cook and stir for 2 to 3 minutes or until the cabbage is wilted. Stir in the bacon.