Replaced lower blower assembly. No small task for a double oven. Actual repair time 1 hour. Total time a bit longer. Easiest way to accomplish this is to build a roller dolly to slide under the oven as you pull it from the wall. Make it between one quarter and one half inch higher than the bottom of the oven. Easier to lift the front of the oven on removal than attempting to lift the back up as it goes back in. Blower motor is inside the back of the oven. Pull the two sheet metal back panels. Disconnect the two spade connectors to the fan assembly. Re attach the new one. Button the back up and slide back into the wall.