Try this. Name it Macropump.m1s, and enable the Macropump in General Config. Then Restart Mach3.
If GetOEMLED(821) then
Message "X Servo Drive Fault"
End If
If GetOEMLED(822) then
Message "Y Servo Drive Fault"
End If
If GetOEMLED(823) then
Message "Z Servo Drive Fault"
End If