2018 Goodman straight ac/ gas pack system. Checked voltage, amp draw, connections, pressures, capacitors, contactor, ensured all connections throughout were properly tightened down and in proper place, tested float switches, cleaned coils, cleared drain lines, and tried to diagnose the vibrating sound coming from line set in wall.also Installed hard start on unit seemed to help a bit with the sound, this system is working properly at this time.