Well, it's fixed!
It really is the simple issue of a floating signal. I also consider this an engineering oversight.
If any of you have a Mana SE, you can easily see if you have this issue.
Put your glasses on first!!
Turn off the power to the board.
Unplug the USB cable from the Nano.
Then turn on the power to the board with the 12v supply plugged in.
On mine, the laser would go to full on and would stay there.
Mine would also turn on the laser when you first turn on your computer if you turn on the machine first. It would also turn on when you go into laser control mode from the T2 software.
To fix this, I installed a 1k ohm pull down onto the laser signal on the large board.
(Solder a 1k ohm resister between the 'S' signal and the center ground signal on the laser connector.)
Any resister value >1k is not enough.
On mine, this left the float at about 0.4 volts. When it is floating after power on, there is a very low level light from the laser, about like pressing the button on the laser module.
Also if anyone is using this board for driving a motor on the red connector, this same signal goes to the gate of a Mosfet that controls that motor. It will come on the same way the laser does without this pull down.
Best!
Kent