[Tiara Open] Electrical Issue: Some helm switches not working

[hiccup]

Some of those are off the Helm B bus, some off the Helm C, so I think your problem is further down the line. From the Helm A/B/C busses behind the dash, there are jumpers that feel the circuit breakers down by your left shin. That is where I would start looking--visually for connections that have popped off and if that doesn't produce anything, then with a multimeter looking for good voltage on both sides of the breakers (with the device's switch turned ON).

If that doesn't turn up a problem, next stop would be switches themselves.