My door locks intermittently will not lock from the drivers side or passenger side. When this happens I think I hear a faint clicking coming from somewhere on the passenger side door. Is there a relay or switch that goes bad with age? There is no rhyme or reason as to when this happens. Just like every problem I've had with my Bonnie it comes and goes. The other day the dash indicator lit up alerting me that I had a brake light out. I changed the bad bulb and it was fine for a day. Now the warning randomly pops up on the indicator..on and off. I checked all the bulbs and they are good. I even reseated the one I changed. I'm starting to think this car is haunted. I've had quite a few little annoying problems since I bought it.

Does it say "brake lamp" or "tail lamp"?

Sounds like you disturbed a ground wire while changing the bulb, recheck the harness and ensure everthing is making good contact.
Lube the door lock acuator on your passenger side door lock assembly. You need a trim tool to pull off the door skin.

I'm not clear on the lock problem. Are you talking about just the lock on the passenger/driver door, or the automatic locking system on all doors?

check out the little tail lamps at the bottom of the tail lamps those might be it

The socket for the tail lamp was defective. I replaced it and it is fine now. As far as the door locks go...they intermittently will not lock from the drivers side, passenger side or remote entry.

Yes, there are some lock relays involved that I would suspect. There may also be a loose connection at the relay. I'll have to get the manual to see where they are.

I know I have the same problem and the power seats stop working at the same time. It ended up being a big resettable fuse/relay that is in my fuse block. I replaced the ones I had since they were old but the problem continues. The reason being is that they will get too hot and trip then once they cool they are fine. It will only happen when I use my rear defroster.
The defroster, power seats and power doors all run on the same 30 amp fuse/relay. It may not be this in your case but it is something worth checking.

Ok, the relay is under the right hand side of the instrument panel. It'* a big square on the right hand side. You could probably find it my clicking the locks on and off. I would also check the wiring there...

And also, circuit breaker No. 4 powers the locks (under the driver'* side with the fuses). It could be that, too....

I believe the lock/unlock voltage actually goes back through the master panel on the driver'* door before going to the relay. I'd pull that, the relay, and the fuse, and clean them all up (contact cleaner) then re-install. It'* possible your relay is getting tired, but this is a natural first step.