On the main Caroline website, Service Message: Friday 28th : We have reports of issues with our audio on the 648 transmissions and are investigating.
I think the standby Nautel transmitter is in action right now. Hope it takes not as long like a couple of months ago.
Audio quality on the Harris is way better, I hear the difference with the Nautel. Maybe it's the same setting on the DSPX AM processor and the same tweaked (months ago) setup in Orford but you can hear a difference in timbre.