We found an omitted checking bench by following one old traveller, so I would start with a part's route rather than trying to interpret the final figures on their own.
Ask the operator who used that bench before ordering new tooling. They may remember whether every bracket went there or only the ones that failed a check.
That sounds like a regular inspection step with possible correction, which is more work than the new layout currently shows; have planning heard that account?
Please come back when quality decides how to cover that missing stage in the new trial; I'd like to know whether the separate bench still earns its space.