I plan on resoldering the critical connections on the PCB on Bosch ECU
for 1.9L engine.  Circuit board has number 2288325840-4/  on one corner.
As I understand, the critical points are where the pins from 25-pin
connector is soldered to the PCB.  Is this correct.  The board appears
to have been coated after the board was soldered.  Does this coating
give any difficulties for resoldering the pins.  Are there other points
that need to be soldered?

John