They saw you comin' mate. I have 1 shower, and 3 microwaves, and none of them have anything to do with each other. Now, forget your shower, and forget the drivel written on your microwave (ok I have that spiel on one of mine) the bulb that illuminates the cavity is situated underneath the appliance cover/jacket. I cannot endorse you removing this though because of health and safety reasons.
Safety first, April 2009