[Richard]

First step if you are not in a hurry is disassemble, clean, and relube the sequence valve. First kill the aux air compressor and bleed off the supply air. Then turn off all water and open the faucet in the bath.
Reach under the white plastic support and loosen the two
Wing nuts that hold it to the toilet. Loosen the two black round tops on the top of the white plastic support. Pull the valves out of the recess as far as you can. Take pictures of
The assembley so you get the different colored lines back in the correct
Locations. Take the five lines loose and also the water line.

You should now have the sequence valve loose. Remove the bottom. Put an Allen wrench in the hole at the top and use an adjustable wrench to unscrew the white plunger at the bottom. The top will now unscrew allowing complete disassembly. Lube it up with silicone and reassemble