Intermittent pneumatic system

[bfk]

Our team wants to use our robot from Breakaway as a test bed for some ideas for this year. After restoring the parts borrowed for LogoMotion we’re left with a set of intermittent problems.
The drive system works properly, but everything to do with pneumatics is at best intermittent.

Sometimes the Spike driving the compressor doesn’t turn on, sometimes it does. Sometimes the pressure limit switch works, sometimes it doesn’t.
Sometimes the actuator (which is what we want to test) works, sometimes it doesn’t.

We’ve changed all the usual suspects, all the PWM cables, the Spike, even the pneumatics interface module in the cRio. All to no avail. The Driver Station shows that the button on the joystick which should fire the actuator is being read correctly.

Since all the strangeness is happening in the pneumatics and in different parts of the system, I suspect a software problem. I don’t know LabView at all and our software guy inherited all the code and hasn’t been able to get it working.

Has anyone come up against something like this? Or do you have any ideas of what (probably obvious) thing we are missing?