I'm hoping you examined the big traces down the side for arcing at the
solder joints.  Everything on that side is either injector or ignition
drive, and the ignition side gets up to around 450V for a microsecond or so
every spark.  Take a look at this and the following seven images.
https://get.google.com/albumarchive/117189706757545167023/album/AF1QipPXMeK1eC37qYxvBWzp03k69WeS8iLDiqhmy0xc/AF1QipO1-rMOL9O5HrVt4omhgfqEXna8Gd28T1nx_T2a

I say that the first and fourth have been arcing -- actually all four
have.  You can see ones with no arcing before and after these.

Yrs,
d

On Mon, Mar 30, 2020 at 12:07 PM David Beierl <dbeierl@gmail.com> wrote:

> Put the ecu back together and in van yesterday. Maybe it will come our for
>> photo shoot :-)
>> That board I shot yesterday is on stand offs ,
>>
>
> It comes off the standoffs very easily by pinching them; but it's not
> worth pulling it out again for our idle curiosity;  I have three open here,
> but two are 022 D which is made differently, and the third is either Bosch
> or Triumph-Adler, whichever one you haven't got.
>
> Yrs,
> d
>
>>