The support page for model MMV5207BAB is
here. Your exploded view with parts list is
here.
The
service manual is here, and it will you important safety and disassembly information.
Unfortunately, the door handle is not available separately. You would have to order the entire door assembly.
It is part number DE94-01381J and it runs $106.99 from
Sears here. (prices subject to change)
William E. Miller
http://www.MicrowaveControl.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"