The red reset button on a TPC400 is top of the unit next to the Run/Program switch. This is a hard wired TMCC device with the wires from the command base attached to the correct terminals. There was a command base cable that was used for this connection. You should be able to daisy chain the TMCC connection from one TPC to another.
Apparently two of you TPC's don't work, may require shop-time for repair or replacement.