Joe,
Some years ago I had the same thing happen to my KN2000 from a power line surge. During a gig some one started throwing breakers on and off in the building fuse panel because a coffee pot wasn't working and the surge blew the keyboard.
The problem was a couple of open fuse resistors - same as your problem. I didn't have the exact parts so replaced them with 1/8 watt 2.2 ohm regular film resistors. It's been working good ever since.
The real problem was trouble shooting and finding the bad parts.
The KN7000 has a fuse resistor in the ground lead of each speaker and several in the power leads that feed the power amplifiers.
It will be interesting to find out if they blew just because of too much volume or if there is something going bad in one of the amplifiers that made it draw too much current.
Let us know.
Walt