Re. Item 1, wagon rear dome light. I thought those big plastic screws were 1/4 turn like everything else with a slot in it -it's been a while since I had that upper panel off. I see just now I've got a light fixture loose on one side so likely a broken mounting stud. Once you start breaking trim fastener studs and tabs it often means either full replacement or attempting to find plastic glues and fillers to make a repair that will last. I usually don't bother trying to jerry-rig a fix for plastic fasteners, but simply start by using sticky black butyl caulk to see if that will hold well enough. It stays soft and will be easy to pry open up later. It's used for glazing and flashings sold in rolls at better hardware stores.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now