Kobelco unit experiencing low output pressure alarms -> Discovered that the Left drying tower pneumatic valve located between the tower and the exhaust muffler was stuck in the open position.  I closed it with a wrench (flats on position indicating shaft) and then watched it for three drying/regenerating, i.e. close/open, cycles.  Seems to be working now.  We have replacement parts on hand in the event that it acts up again.