Hey no problem, I appreciate the thought!
I believe these bulbs and a couple others just went due to age. The car has 130K on it and with these auto headlamps, all the bulbs get used a lot. The last one to address is the door lock, which comes and goes. Could be a cracked filament moving around and occasionaly makinig contact, or a bad/cracked solder joint for an LED if it is an LED in there. Usually with these old bulbs, if you flick them hard enough with your finger, you can break the filament inside.
