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this looks like engine oil to me. the only way oil to get there is leak from engine valve cover gasket and creping or dripping down. Have you tried using a mirror and a flash light for locating a leak from top, which can be dripping on the connector and entering connector?
Access ECM located behind Glove compartment. Remove computer from vehicle and remove screws to open computer box. you can examine for presence of oil. examine connector E5 first while disconnecting it for presence of oil. This is same connector which is used for transmission connection.
If ECU is full of oil but it is working fine, then there is no need to replace it. you can spray wash circuit board with brake cleaner and blow dry with compressed air. wiring you will have to replace and Solenoid wiring connector.
Here I am sending you connector view. Tranny oil pan has to be removed for this operation. I suggest you replace tranny filter at same time, if you end up doing the work.
after oil pan is installed, you need 2.0L of tranny fluid to top up transmission oil. use ATF Type T-IV fluid
I have sent you a picture of oil pan connector.
please click H E R E to see oil pan removal procedures and wiring colors.
Thank you for the accept and Good rating!