Redoing every fastener sounds like overkill to me. A wrench reading 12 low once doesn't mean every nut you touched that morning was about to fall off, and modern clickers are pretty stable unless you really abuse them. Plenty of shops run theirs for years and just check them against a beam or a known good wrench every few months instead of mailing them off. If you're worried, do a quick sanity check before a big job, but treating a single drop like a fleet-wide grounding seems like a lot of drama for a hangar floor.