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You are so good, at lay this stuff out. KUDOS! I'll add: If replace ECU. Not only look at your's PN. But pull PN by VIN#, see if it sub to a newer PN. Use newest PN if you can. Don't use with PN #, older than what you have now. But again. Looking at this wire harness first, may save you time...

It's possible the AHC ECU bad, but not very likely. If you do try a used ECU. Be aware factory did change PN#'s. There is 2 possibly 3 PN #'s. I suspect the change was do to issue, in older model ECU like you have. Was issue a fault or just to get better ride, IDK. I went down same rabbit hole...

You said you checked and cleaned all wire housing block. But did you! Water entry in LH foot well, seems to be the start of issue. So I'd check wire blocks there, which are not water tight wire housing blocks. I'd also look under vehicle rear 1/4 LH. As we drive water flings up there. We're...