Finally stopped chasing intermittent faults by wiggling the connector loom in the dark
I spent four shifts on a flap indication issue that only showed up in the morning, and it turned out to be a chafed wire hidden behind the clamp. Started using a cheap inspection mirror and a flashlight to look behind bundles before I even grab the meter, and I have caught two other bad spots since.
Who knew the trick was just looking at the thing instead of poking it in the dark like a caveman? Four shifts of wiggle therapy and it was a chafed wire the whole time, sounds about right.