If you have two chillers, and the loop is colder than the outside ambient temp. you can run chilled water through the chiller you are going to repair and that will migrate most of the liquid into the evaporator, but you have to manually open the EXV first. The alternative is to run the other circuit to get the evaporator cold. Either way, you will have to open the EXV, migrate the liquid, close the liquid and suction service valves, and vapor recover down to a couple PSI.
If the valves hold, you should be outta there in a few hours.