Happens every couple months or so to the Zilla.
Not the SLE though, but then again, that'* not really possible.
I have some phantoms in the dash. Time to pull it again (it'* been almost 5 years?)
EXACTLY 5 years ago, back when I was troubleshooting my rear steering.
Anyway, I noticed if I 'thump' my oil pressure gauge, it jumps about 5psi. Boost twitches a bit then too.
I'd say it'* time to pull it and clean things up again. Board by board.