The overhead light assembly on a 1994 850, (with push buttons to turn on and off, automatic lights when doors open, so on): how does it come off? There are no screw holes, places to wedge a screwdriver, so on. I don't want to break anything.

 

Pry off the light lenses. Small screwdriver for that. There will be two screws inside. Pops right after that.

 

Thanks rrochelle8, that makes my life a bit easier.

 

The screws are T-10's. You gently pry off both of the lenses and then take out the two screws. The housing itself is just held in place with some spring clips and you gently pull down on the plastic and it will pop out of the headliner. There is one electrical connector that has a retaining tang on each of the short ends. I had a bit of trouble as I could only see the one tang in the dark and couldn't get it apart until I grabbed a flashlight and looked close. I just upgraded mine to LED's this evening. If you're doing that the positive is the copper strip that runs to the bulbs. The black wire running from the socket is the negative. I soldered mine in but next time I'd get the ones with the adapters.
The one in the cargo area (wagon) is a "festoon" style so that was easier as mine just dropped in. Now I have extras but for two fifty a bulb it's wonderful light.