^^^^^^ sounds like they are being honourable with the testing.....given their rep. one would hope they will give a substantial discount, based on hours run, on any proving faulty...of course, one can also expect to see a dramatic reduction in the designated service-life of these components.
Having said that, consider the number that have run high hours faultlessly, V the one failure and the small number found unsound.....a faulty batch sounds a plausible explanation.