From references it looks like the HSCP A31m1 and the duovalves are separate componants, they are (3 units)clustered together on the drivers side fender well or engine. They look like three small tin cans. A31m1 is larger than the duovalves

Wires are for HSCP (brown&green wire) and a (grey &red) the 2 duovalves have what appears to be 3 wires going to them a (brown&red) a ( grey&red from HSCP) and a (brown&purple).

They can be replaced separately. But you might check the connections/function before replacement.