Opened the 2 91 ECUs both looked very clean no corrosion on either boards. I looked at the 90 board it has a quarter size spot of flaking on the board guessing that’s some leakage I found. I have another 90 ECU coming today I’ll look that over when it gets here the box is trashed but I have another cover box I can use for it if the boards any good. A good box is necessary to fit in that tight spot it goes into it’s kind of a pain.

Will end up holding onto the good working 91 ECU for now and sending in the one with the issues for repairs, then I’ll send in the 90 ECU that looks the cleanest of the 2 for starters. I need one good one for the 90 to get it running before I get too deep into it. I can always sell the rebuilt ECUs down the road if it comes to that.