Model no is incomplete but will presume it is integrated appliance, if so isolate from mains supply, slide microwave out of housing far enough to see a little trap door on top of casing. remove trap door and bulb is there, it a 40w bulb 300`C with E14 thread, about the size of a golf ball. Dont try to get to it from inside oven you wont be able to, you will just undo a lot of screws that will be difficult to get back in . Cheers
Kenjo, June 2012
