A decent tech might have the Full Bosch Service info, it's available on CD (around 10 of them for the full whack). I find this handy, I can get all the circuit diagrams, diagnostic info, etc etc (and etc) for my 190E

later

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg