Just cries of a torn monovalve diaphragm...

Might be a good place to start looking. Very simple to pull the guts out and take a peek. Right next to the battey in an SD, 4 small screws hold the top on. Remove screws and lift on silver shaft and the guts will come out. Do this gently and you can keep track of where they all go to put it back together too.

If the little rubber diaphragm on the bottom of the shaft is torn you cna get a replacement "monovalve repair kit" at Fastlane on teh top banner of this site. great service and only about 30 bucks to fix.

if you want more info then search this forum for monovalve repair. Lots and lots of posts on the subject.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique