Though I cannot answer conclusively I thought that I had read somewhere here that the answer is replace...
Sorry for the bad news.

Could it just be though that the connection is not as it should be? I'm trying to think positive for you...

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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