I can't look it up right now, to see if it would have the affect you're describing but the ground in the dome lamp housing is renowned for corroding. Pull the assembly apart, clean all the contacts with a wire brush and check the spot where the ground is riveted to see if there's a lot of corrosion. If there is, drill out the rivet, clean the contacts with sandpaper and reattach with a new rivet or sheet metal screw. Heh, I can't even recall if there's only one ground or if there are two... Well, same thing either way.
If that's not the problem it's probably the Integration Relay #1.
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