Cracked solder joints in MB electronics are very very common. I don't know why, probably just that everyone drives these things forever. After all, how many Toyotas or Lexus have 300,000 miles on them after 18 years?
Re-soldering has fixed many a cruise control amp, ACC pushbutton control unit, and relay!
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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