I have in my hot little hands a 2.1 ECU without the B or D on the
tail end of the part number and it came off an 87 Syncro.  It has a
little sticker on the back with initials and a September date written
on it on a small round yellow sticker like you'd see on a garage sale
item.  Upon opening up the unit (I couldn't tell a good solder joint
from a crappy one) and visually inspecting it, I'll describe what I
can ID and then the electronics gurus can maybe chime in and tell me
if this looks/sounds like Darrel's work, or whether it sounds like
factory stuff..  I don't think there''s any question that the innards
have been played with as the internal phillips screws holding the
circuit boards have certainly been twisted.  The big thing I noticed
were several dabs of a white caulk-like substance in and around some
of the electronic pieces that I would find strange to come from the
factory like that.  Again, I'm not an electronics person, so let me
know what you think.

TIA

Max