We currently use a leaktester to inspect for leakrates on parts we produce. This inspection is done as a 100% sort. We exspect approx 5-25% of the parts we inspect to not pass. Our customer has requested that we reduce our upper limit on our test based on gage R and R results. I understand the reasoning behind his request, but is there any data/information I could use to justify testing at 100% of the upper spec tolerance?