Irg,

I disagree that replacing the bulbs will help find what is blowing Janko's fuse. Corrosion in the bulb sockets may cause an open circuit and the bulb may not work, but it will not cause a short circuit which is what blows fuses. If the bulbs work, leave them alone, they are not the problem. I say again:If it ain't broke, don't fix it.

P E H