I recovered remaining refrigerant. I removed the leaking air coil, txv and refrigerant biflow filter drier. I set the air coil and brazed in the new txv and the lineset. I ran drain line again and sealed the unit up. I replaced the biflow filter drier in the cube. I replaced valve cores in the service valves. I used dry nitrogen @ 300psi to check for leaks in the joints I brazed and the rest of the system. The system held that pressure for 10-15 minutes while I called WF tech support to get the weigh in refrigerant charge. I let pressure flush out the lines and then pulled a <500 micron vacuum on the system and then added 8lb 2oz of r410a refrigerant to achieve 10 degrees subcooling and 20+ degrees delta temperatures across the evaporator coil. System has no leaks and the unit is operating normal. Customer paid remaining balance and the job now has been paid in full.