While performing a test sometime ago at the X-End purge air system the fan for the aftercooler was found to be faulty, report in aLOG entry 74833, aftercooler fan was fixed, report on aLOG 74989, and today finally got a chance to run and test the dew point for this unit.  The dew point was taken at the point of use by the purge/vent valve and read -49.3 degrees C.  No other issues noted.