Arrived on, 8-16-23 Ron F-Opened up each unit for inspector. He found each unit needs delimed and each unit needs new sight glass. Found far right unit may need element if can not be delimed. Returned on, 9-5-23 John S/Ron F-Opened each unit and replaced sight glasses on left, middle and right units.delimed each unit. Tested and found in working order at this time.