Arrived in Bastrop for AC Maintenance , Upon my arrival I performed a 6 month checkup on one straight cool furnace system. I found everything on the indoor to be operating properly at this time. Checking pressures at the outdoor system I found that the pressure were showing some discrepancies. I added 1lb of R410a and found that it was just slightly low on refrigerant. I did verify there were no signs of any leaks on the indoor and outdoor systems. The slight lack of refrigerant could be over the duration of us checking the charge on the system. We will monitor this and if at the next cool eval it is showing low again we will do a more in-depth leak search on the system.