Sounds like there may be more issues from the fire. I do know that the #74 code is directly related to the compressor. I got that code and just performed the piston rebuild kit you can buy on ebay from "bagpipingandy". You'll see the list for the E53. Very simple just follow his video. I was skeptical but I figured I'd give it a try and it worked flawlessly, so far. He ships from the UK and the US so make sure you get the right one. You'll need to clear the code after you perform the rebuild. As far as your other codes sorry I can't help.