You should contact your dealer and replace the air button control. Also, Jacuzzi improved this design to a switch type of injector in 2007. It should be an easy fix.
I have a J345 r with toggle air buttons purchased last October and I am having the same problem with intermittent air leaks with the buttons off.
Two different dealers have been out on service calls, replaced all buttons twice and it still happens. It leaks about 20% of the air in a pulse pattern and comes out of only two of the jets.
Now both dealers have told me that this is normal.
I wish I could find someone to figure out why it is happening. It did not happen when the tub was brand new and for about four months.
If any knows a possible solution let me know or is this new toggle air button a bad design.
Thank you
Greg