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First I am openly admitting my stupidity.

I activated the ATC on my RC73.22 Colombo Spindle while it was running. It now won't releast the tool holder (ISO20).
I have tried everything I can think...

Just typed a whole thing but then lost it. If you get this twice, my apology.
Set up a couple of 1/4" tubes on either side of the nut, attached to the nut and run a small amount of air through them...

I have had a Series 1 R2C3 mill for a couple years now. We spent a fair amount of time cleaning it up and mechanically it is in very nice condition. It has the Heidenhain TNC145 controller. I...