Read the ACARS and post again ...
Good point !
I checked the sequence and indeed there seems to be no slot in the ACARS list where an A/P re- engagement could have taken place.
(Btw. I am assuming an A/P re- engagement would not appear in ACARS - am I right ?)
I thought maybe after 2:11 but at 2:13 was the PRIM1 / SEC1 fault.
That would disconnect it again and at least then the disconnection of A/P would appear in ACARS.
So I agree: you can skip that idea.