Oops, you are correct. Now that I think about it, it was axis 1 off the second 2400/10 robot in a 2 robot cell. Very sorry for the mislead.
I don't have a 2400L here, not sure if there is enough slack in the motor cables to reach another motor. The sheathing on old 2400 wire harness cables tends to get brittle so not sure if trying to stretch them is good idea though.