Originally Posted by Thalweg
I've had this happen many times in cars over the years. I disconnect the battery. Spray it pretty heavily with WD-40. Let that soak for a little bit. Then work it out with long-nosed pliers.
Yep...Then coat socket and bulb base with dielectric grease.
Do all bulbs and exterior screws, fasteners, rubber seals and stuff that ain't supposed to stick.