First replace the two green/black O-rings under the EHA and pray that' resolves the leak, otherwise you must replace the unit (DO NOT BUY EBAY EHA's). You must buy new and they are ~$240. From there it may require adjustment to flow match with the distributor.

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2016 Monsoon Gray Audi Allroad - 21k
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2003 Gray Mercedes ML350 - 122k