Disconnect the power to the microwave and remove the grill above the door.
Open the oven door,slowly raise the door evenly,disengaging the pins at the top and bottom.
Pry away the choke cover starting in the right hand corner. Use a putty knife.
Work around the door until the choke cover is completely loose.
Slide the latch assembly upward and to the left to release the plastic tabs from the door frame.
Once the latch assembly is loose the spring may be disconnected from the door frame.
Remove the screws securing the door frame assembly to the door panel.
Remove the door frame assembly by releasing the tabs around the entire door panel.
Remove the door handle by removing the screws securing the handle to the door panel.
Here is a link to your microwave model MMV6178AAS. | 
Replace door Handel on Microwave 
