While chasing an occasional momentary engine dropout that happens
when the rear wheels hit a bigger-than-usual tar strip or some such,
today I opened up the ECU.  It's a Triumph-Adler.

What I found under 40x magnification was that every single large
component on the board (other than chips, but including a SIP
resistor pack) was showing signs of fracture of the solder
joints.  Before reflowing the joints I took a few pictures which you
can see here:
<http://picasaweb.google.com/dbeierl/SolderFatigue#>.  You'll get the
best view if you load the picture and then click the full-screen
button at top left.  Note that in addition to fractures directly at
the lead, there are also some part way out the radius of the copper foil pads.

  --
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'89 Po' White Star "Scamp"