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open it up and inspect. look at the tops of the capacitors for swelling or leaks.

how did the ground check go? a set of booster cables can add some grounds in a second.
I had a bad asd relay once, it was mounted upside down and condensation caused it to fail. I chased that relay...

I would compare two parts. hoping for the similar values. might find something open then it would be obvious

check the HEPS with a multi meter? put the original back it, it may have healed by now. fuel pressure?