I am having a sligh problem in a 93 400sel. The pump works fine, it just when I unlock the doors, it seems as if air escapes on the left rear door near the wheel. I thought it was a leak, but it is not close to the door lock. Also, when i turn the car off, the pump sounds like it is working for about 15 seconds. Happens everytime. I looked at the posts on adjusting the screw on the pump, but is is not the same as the one in the trunk that was shown. Any ideas?