Recover all of refrigerant, remove and replace thermostatic expansion valve and liquid line filter dryer, nitrogen pressure test, evacuation micron test to 700 microns, recharge with 81 oz new R410A The heating refrigerant circuit is running in very good condition at this time with acceptable refrigerant pressures 21 PSI higher than running test pre-part replacement. Running pressures before 68\345 Running pressures after 89\335 @ 42°incoming pressurized ground loop and producing 94° supply temperature with 67 return