I just received a Mycenter 2x that also has this same issue of a LOT of air being consumed around spindle area even with no power.
Were you able to track down the reason on yours?
Tere is belt cooling air jet but I have located that solenoid yet.
If I understand the book there are only three air sources at the spindle:
1) oil/mister
2) belt cooling air
3) tool change air blast
-Tom P.