Found system charge slightly off not allowing TXV to close causing system to not cool enough. Added 4 oz r410a out of 84 oz total charge on system. Cycled system checking operation - preemptively changed filter - customer provided and requested. Checked all fittings inside and outside for potential refrigerant leaks did not notice any evidence of refrigerant leak. Everything is operating normally again. Recommended to watch system over next couple days to track performance.