Hi Ryan,
Thanks for the correction - it's {'LED', N} where N is the port number
I'm worried about the relay - if you're trying to drive a relay directly from the BNC output channel, it's possible the BNC isolator IC was damaged. Mechanical relays typically require more current than a TTL I/O line can provide directly, and without a flywheel diode, they can discharge backwards into the circuitry when the magnetic field collapses as they are switched off. This page has a few example driver circuits (I'd use the version labeled 'N-channel MOSFET'. Another option is to use a solid state relay, which can directly interface with TTL logic (though you'd still need a flyback diode).
What kind of valve are you trying to drive? State machine r2's onboard valve driver is powerful enough for most things you'd use in a behavior lab, and is robust against most failure modes.
If you contact us at sales@sanworks.io, we'll send you a shipping label to return the machine for repair. We can have it back to you in under a week.
-Josh