Found unit off, ran found contactors not engaging. Lowered computer, found when computer calls for heat, relays are not energizing. No heat, Led on interface, Swapped computer with right vat, issue stayed with interface. Will obtain new and return to replace. Will need AM service to replace I.O. board on left vat. Also top front cover is slanted forward, needs to be removed and cleaned to fit. ** No charge labor per Service Manager for 7/13/16 Found unit off, turned power off at breaker. Replaced interface, cleaned excessive oil build up from control area, re-seated front rail, ran unit, found normal operation.