Your correct its reversed. I will mess with this some more in a couple hours after i run my daughter to the doctors Ill let you know what i come up with
The 7905 shouldn't produce nearly -7v. It's either defective or something is feeding voltage back into it. If you remove it, what is the voltage on the pad that has nearly -7v?
Reinstall the driver board if you've checked everything you could on the main board (gate resistors, etc) to see if you still have DC. Getting the regulated voltage right may not have solved the problem but it needed to be done to eliminate it as a possible problem.