All three sets of the affected pins return 6.5v.
So despite having the pin turning on and off in code (are you sure you programmed it right?), it still only gives you 6.5V?
Looking deeper, I noticed you said you are using the Hardware servo controller. Then you go to say it doesn't work for pins B5, B6, and B7, but it does work for B4, H6, and H5.
The funny thing is, pins B4, H6, and H5 cannot use the Hardware programmer - it's physically impossible! lol
You should look into making sure you programmed it right . . .
I just don't have a functional on/off switch anymore.
No idea how you managed to fry the switch, lol . . . you can probably snap it open to see what went wrong inside and manually repair it.