Thanks for the thorough explanation and pics. This exact situation happened to me, codes and everything.
Also, if you can't reach the phillips screws head on, DON'T do it at an angle. I tried to do this away from home using the BMW toolkit screwdriver. You can easily strip the screwhead like I did. Find a shorter driver or carefully remove the engine hoist bracket (wait til engine is cool -- it opens up the cooling system)