Complete 2 Systems worked on DS Goodman Straight A/C: HO stated he had another company over the weekend. And tehe told him lower unit was completly out on ref. Connected hoses and didnt have any ref. Performed a leak search. Added a fee onces of 410a and notrogen, up to 400 psi. Coudnt find any leak. Opened service ports and found the closed. Release all notrogen from system. Released ref from condenser. Turned on system and pressures are great. System is running properly.