[Al Skierkiewicz]

Guys,
You may open electrical components to make repairs under the current rules. However as pointed out above, it does require some skill to get everything back in the right place to allow correct operation. FRC vendors are very helpful and as suggested by Oz and Paul get in communication with the vendor for guidance.
The red wire is part of the three wire specification as it supplies power supply to servos when used in R/C applications and FRC servos. It is not needed for motor controllers since there is a separate power connection and that is why it was not connected in your controller.