How are they taking the temps of the uth? Make sure they are taking temps with digital thermometer with probe or temp gun under aspen against the glass over uth and that it's no hotter then 94. If they have analog type thermometer or if they have the digital thermometer probe hanging in the air and they are getting a temp of 90 then the uth heat will be way to hot in there or if they are taking temp on top of substrate it may still be to hot.
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