Open it up and there are 3 (or was it 2?) relays (big gold things with coils wound round), each soldered onto the circuit board.

Just resolder them! They're big joints, on mine the small solder joints were fine.

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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