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Don't worry about the orange stuff as it's just a coating to protect the PCB and components.
What does the other side of the ECU look like?
The other side is a massive heatsink for the huge array of transistors there because they get hot. They also might be the cause of the failure, but you'd need to check each one.
Based on all the surface mount components I'd guess there is barely anthing on the other side.
Past - '95 VW Golf MK3 VR6
Present - '11 Ford Focus LW Diesel (PSA DW10C)
I would be looking at the other side where the ECU plug is. As you have said that the other side has heatsink on it then I really wouldn't be surprised if it's that side that has the issues.
Even if it looks alright, remember, solder joint cracks can be really small and it only takes one to mess it up.
Just re-flow the connector and other spots that look like they might need to be taken care of too.
Past - '95 VW Golf MK3 VR6
Present - '11 Ford Focus LW Diesel (PSA DW10C)
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