Problem 3 is the only one you have to worry about. The wires look aftermarket, trace them and cut them out if they no longer do anything.

I have a post from two years ago when I yanked the rear window in the SDL to fix this. Mine was rusted that bad, yours is probably pretty bad. But you won't know until you get the rear window out. Mine is starting to bubble again even though the car on gets wet once in awhile back there. I am beginning to think the only way to fix it is to cut the old metal out and have new metal welded in, followed by a body shop spraying some good paint on it. At least thats how I'm going to do it on the second try.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200