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I have U3401A. Agilent support confirmed that problem with diode test and told me that U3402A has the same problem. Its firmware issue and does not effect accuracy.
I think I can get you a brand new meter for $350 + shipping if interested...
U3401AThey had that problem since they are produced, however, Agilent was not aware of that. I reported this problem a month ago and they confirmed and told me its firmware bug. Not sure when they will release upgrade.