2018 Goodman Heat pump/air handler not working because system is low on refrigerant. Customer decided to approve the BETTER option with adding refrigerant and preforming a electronic leak search. Only leak I found was at the service valves (upon arrival there was no caps to be found). I added 3.5lbs of refrigerant and installed service caps to valves to prevent leaks. System is now working properly. 16x20x1, pics uploaded