Another thing to check off the list - thankfully, it isn't the LCM - I disconnected all three connectors to it, and checked the current draw after each disconnection, and got the same 4 amp current draw each time, even with all three disconnected. So I've dodged a $400 bullet.

I'm running low on things to check. I'd like to disconnect the connectors to the front and rear dome light modules, but I'm not having any luck prying the clear plastic cover piece off of the rear one. I can see a pair of indents at the ends of the long side of the clear plastic cover where it would appear you'd have to insert your screwdriver blade and pry, but it isn't coming out, and I'd hate to break it. Is there something else I have to do to get this cover off?

And any other ideas of things to look for that are protected by fuse 27?

__________________
2003 X5 4.4i
1992 Porsche 968
2007 328i
2014 Subaru Forester XT