At 09:03 PM 7/6/2012, neil n wrote:
>On LH end of the PCB, there appears to be some kind of corrosion.
>Almost looks like rust. That edge of the PCB is a different colour
>than other edges:

Certainly looks as though some water got in there - what does the
inside of the case look like?

>Clean up with Isopropyl?

I guess.

>And, I *think* this is simply rosin left over from factory soldering
>job, but could they be signs of heat damage?

Not from factory but from rework of some kind - replacement of driver
or reflow of bad joint.

>I won't separate the boards from each other. There are white globs
>covering what may be fasteners and white ribbon connectors between
>them.

Those are soldered connections -- apparently VW noticed that they are
among the most prone to fatigue failure of the solder and hoped to
help - I'm guessing that's an 022D ECU with some surface-mount
components on the back of the big board and a substantial shield can
over the small one.

Yours,
David