And that's another one gone! Noticed the boost gauge stopped working this afternoon, and the light for the rear window heating element was on all the time.
Quick check of the fuses in the boot showed the 5amp fuse had blown. Replaced the fuse, and the rear element is working correctly, and the boost gauge is working.
Reverse camera is dead as a door nail!
I wonder if the power feed is what has been causing problems on all the other ones as well, as this is the 3rd that has gone now in just over 12 months.
Going to remove it, and leave it removed, as I can't be arsed anymore.