I have a FW that I bought for my BD about 5 years ago and just love it! I have gone to Dave McCallum's class on maintaining it yourself and it's a wonderful class. I recommend his book if you're not in an area where he teaches.
I followed his instructions with the light bulb in the case and it worked. To keep it fresh smelling I also put those packets you get in shoes, etc., (silicone?) in the box and it helps keep it moisture free (the cause of the problem). Also, grate deod bath soap and make small packets to put in box. That helps with any smell. I did the light bulb thing once and haven't had to do it again.
I also changed the felt oil drip pan thing and that helped too. I copied one off for a pattern and use the sheet of "stiff" felt from a craft store to make my own.