now there is just the little 7 volt problem

So this button stilled had 7 volts coming to it.  At least now we can go back to what we thought that last one was and re think about this 24 volt bell audience call button.  So in looking at the drawings again we realized that this system just had to be getting it's power from front of house.  So back to panel G2, but where is the transformer?  After searching through all the rooms on both sides of  this room suddenly we were noticing the floor instead of the  higher wall and one of noticed the transformer  sticker here in the cement surrounded by the front of house CnC stuff.  Eureka finally something is starting to make sense.  But still in the panel there is no marking for a circuit that would be going to this transformer.  So where is it getting its power.
In looking at the transformer we realize that the only way that we could have a 24 volt system  through this transformer it means that we have to have 240 input.  Seems crazy so we look into the panels on our left to see if any of the breakers are ganged together.  There isn't,  so that makes for more interesting investigation.  Things are confusing again where are we getting 240 from?
So in pulling off the box covers we noticed that the conduit hole in the back box was going into the wall not to the right where the panes were located.  so how do we follow that.  We count out our steps and go into the lower lobby and count out the steps again and the only thing in this area was this G2- 08 double gang.  So we decided to pull off the the cover plate to see if this was a pass through for the power.  Low and behold it is and we can see the light in other room where the transformer box are still uncovered.

But it seems the power is not passing through but ganged together with the outlet
Weird,  So back to the transformer on the other side of the wall.  IF we meter it and start turning off all the things that have 240 maybe it will turn off.  Nope, but the outlet we have been looking through is labeled 8 so lets turn off 8.  There it is, half of our 240 is coming off of the 8 breaker.  Now we have to find the other leg.  Lets try the next breaker down 10.  Yep there it is if 8 and 10 are on then the transformer has full power of 24 volts.  both 8 and 10 have no indication that they may be ganged together or that they may be powering the audience call system.  But now we have found it and the SMP has been tested to have no more errant voltage.  

That was fun