I have owned a 2009 E350 4matic wagon for about 4 years. Purchased with 130k miles now 157k miles. The rear end has always sunken down evenly after a week or so and now sometimes drops overnight. Always evenly and always back up with 1.5 minutes (or less). Are the bags leaking, a hose leaking or a valve? Replace everything or convert to coil springs?
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