Aurora not transmitting power and Error re-enabling PA, Overcurrent Fault

I just answered this in Facebook.

I spoke with Tony, K1KP, the designer, and his assessment is that the radio experienced an open condition on the antenna port. What does that mean in practice? The fault could be anywhere downstream of the sensors: inside the radio itself, at the SO-239 socket, at a connector, in the feedline, or all the way out at the antenna. SWR tells part of the story, but this kind of event can happen so fast and at higher power levels that only the Aurora (like the PGXL) has the protection circuitry fast enough to catch it. Traditional radios simply would not see it coming. There are also signs that the operator attempted to return to transmit before the faults had fully cleared, which compounds the situation.
The next step is to isolate the problem by changing variables and seeing if it can be recreated. The most practical starting point is to substitute a known-good jumper cable and dummy load for the antenna and existing jumpers, then attempt to reproduce the fault under controlled conditions. Joe, I would also encourage you to inspect any adapters in the RF path. A 1.84:1 SWR on a 50-ohm system puts the feedpoint impedance at either 92 ohms or 27 ohms depending on the nature of the mismatch. At 500 watts, that works out to approximately 214 V RMS and 303 V peak at 92 ohms, or 116 V RMS and 164 V peak at 27 ohms. Either way, that kind of voltage is more than enough to find a weakness in a marginal connector or a bargain-bin adapter very quickly.