I have a two year old Goodman Heat Pump using R-410a that had a schrader valve go bad near the A-coil. The tech came and found the schrader valve problem with a sniffer, valved off both lines at the outside unit, and replaced the schrader valve. He then opened the valves and recharged the unit. My question is was the problem repaired correctly or should the system have been reevaluated and a new dryer installed? I was told that the scharader valve near the A-coil was a common problem on this unit.