Looks like the cut was to separate some circuitry from +5V on the control board. Then on my unit a separate blue wire was run from the power supply to bring +5V to that circuitry. This may have been done for noise reasons.
Bob
Bob
From: "josh.nursing@gmail.com" <josh.nursing@gmail.com>
To: PolySix@yahoogroups.com
Sent: Thursday, January 2, 2014 8:01 AM
Subject: [PolySix] Common MG control board issue
To: PolySix@yahoogroups.com
Sent: Thursday, January 2, 2014 8:01 AM
Subject: [PolySix] Common MG control board issue
Happy 2014 to all.
While continuing to investigate my malfunctioning Polysix, I inspected the leftmost control board, the one which has a blue connector soldered to the power supply.
If you follow that trace, you may find a break in the line somewhere as I did. A break was also found in the same board of the spare Polysix (now being parted), and also from the Polysix of a member on French forum anafrog.
I repaired both boards.
Yash