If, as you say, you can make it squeak standing still. Get a length of garden hose, put one end to your ear, get someone to make it squeak and move the other end of the hose around until you locate the source.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)