I used this video to do the job. It's a great video! I've already removed the alarm. However, he doesn't show how to put the center drain pipe back in. The hose is bent in an S (kind of). When I get the hose in, no matter which way I turn the funnel, I can't get the botton to seat in the hole. Instructions say to turn it clockwise to insert it but to do that pinches the funnel and in fact, mine cracked. I've just ordered a new one Mercedes-Benz Drain Pipe - (170-830-01-25). I still can't get the *#*#*#* in!