Found this online for replacing hinges on a household model magic chef. When the hinges and screws are removed the door will come apart which should give you the access you need for cleaning and repair.
Open the door completely.
Flip the hinge latches all the way down on both sides of the door.
Close the oven door. Lift the door up and away from the Magic Chef oven to remove it. Set the door down with the inside facing up.
Remove the screws along the bottom of the door frame connecting the inside door frame. Lift the inner frame off.
Remove the screws holding the faulty hinge in place. Lift the hinge out of the door.
Insert the new hinge into the oven door. Install the screws that hold it in place.
Replace the inner door frame. Install the screws that hold the frame to the door.
Replace the door onto the oven. Open the door all the way. Flip the hinge latches up.