??
I took many apart to change the lights. I hate to say it but I don't remember anything that was extra difficult. Almost all pass cars that I've worked on require removing the bottom screws and the car's ends. Sometimes the trucks hit the side when sliding out of aluminum bodied cars that require slight bending or removal of the trucks first.
I believe these are very easy and just the bottom screws removed so the bottom came off?
https://ogrforum.com/...amtrak-pass-car-leds