Sorry, I can't help but have you found an "indie"to work on your car yet? Unless you are really good with cars you should probably track one down. He would certainly have a source. Did you have a pre-sale inspection done by anyone? There is another section of this forum that shows recommended shops for all states. I'm sure you will find plenty of choice for OC. And you have the Mercedes Classic Center in Irvine.
Anziani