During the daylight it was easily recognizable that the leak was coming from the king valve that was not all the way backseated and the cap was loose on it. I backseated all king valves and put thread sealer on the threads and tightened the caps up as tight as they would go. I also tightened the bottom flare a little bit but it had not appeared to be leaking. I pressurized to 450psi with dry nitrogen and used soap bubbles and electronic leak detector to see if there were any remaining leaks and there were none. I then evacuated the system and pressurized again with dry nitrogen and let it hold pressure then used the nitrogen to flush the lineset. I then pulled system into a <500 micron vacuum. I called Mitsubishi to see if any additional charge was needed and was told that the data plate was the only charge amount required. I weighed in 4lb 3oz and cycled the unit to heating. I left the indoor unit set to heat to 70 so that by the time the customer gets home they will see that it is wo