Per Steve Semmer's suggestion, left a bad TRH (015 from abc2) in the soil oven at between 35 and 40C for a few hours yesterday. This unit was giving a RH of -3, with a raw value of 0. After the baking it was generating believable T and Rh in the trailer, but upon blowing on it, the RH would go up to 50% and then cut out, back to -3%. Same thing happened when putting it outside.
Left 015 and 023 (from wslope6) TRH transducers in the soil oven at about 40C overnight. Later the next afternoon tested 015 again. Data "looked" ok and couldn't get it to fail by breathing or putting it outside.
Tom doesn't trust it, since the calibration may have changed, so we'll send these back to Boulder, along with some Tsoils.