380SL Lambda Location

I have a wire short from the Lambda unit to the idle control unit on my 380SL. It is intermittent. Sometimes I get 4 volts at pin 2 on the idle control unit and it runs fine, then I get 0 volts and I get the high idle. I Checked the relay. God I hate to work on 107 body SLs everything is stuck where you can't get to it! Anyway somewhere between the idle control unit and the Lambda unit I have a short.

Stupid question but where can I find the lambda unit on a 380SL.

Thanks,
Michael
69 280SE Coupe
61 220SEb
66 300SE cab
91 300SEL

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