Shield bonds are the step everybody skips because a meter just sitting there reads fine until you load it up. The trick is never trust a plain ohm check, run a bonding meter or a low resistance tester that pushes real current through the joint. Anything over a tenth of an ohm on a braid and I am pulling the backshell apart, because a corroded ferrule or a little corrosion under a clamp will bite you at altitude when things vibrate and heat cycles. Flex the harness while you measure too, that is where the bad ones show up. Nine times out of ten the gremlin is hiding in a ground or shield path, not the box or the pins. Takes five extra minutes on install and saves you three days of chasing ghosts.