Upon Arrival homeowner told me that he installed his mini split and thought that he overcharged it. Put my gauges on and found that the unit was bone dry on R-410A. Pressurized system with nitrogen and found leak at flared fitting behind head unit . Tightened both sides down and went thru all fittings and tightened down. Vacuumed system down for 30 minutes and charged system with 3.5 lbs of R-410A. Checked superheat and everything operating properly as of now. Also added UV dye with leak stop