No cool. Found system calling for cool. Condenser fan and compressor running. 0 cooling. Hooked up gauges and checked pressures and temps. System empty. Checked braze joints, no oil found. Added 350psi of nitrogen, held for over 25 mins with no drop in pressures. Pulled into vacuum. Pulled down to 873 microns. Held. Added 7lbs 11 oz of r410a refrigerant and dye stick. System cooling at 20 on split. Subcooling was 13. System operating normal at this point. Office to schedule return UV leak search to find leak. System operating normal at this time. Job complete. Due to age of system, office to price. Job complete.