[kdub]

Thank you for all the reponses. I hope I am one of the lucky ones who will never have water intrusion problems.

As for the posted diagrams, I cannot figure out what "A" and "B" are. Is that a depiction of an airhose and a probing device to clean the drains??

How should one clean the drains to make sure the whole route of the tubing is clean?

**edit** What is the "service position"?

thanks for tips!