The fact that the two initial errors were ABS and KTRC would lead me to look for something wrong in something involved in one or both of those systems. Just for example: something like the individual wheel rotation sensor(s) (indie pendant systems on each wheel) which are used by both systems. It just strikes me that those two errors are too closely related to be truly random. I would suspect something like a bad sensor, a misaligned or perhaps slightly dirty sensor, or especially a loose or corroded connection to one of those sensors.
It is pesky cases like these where the modern, very sophisticated vehicle really can be a problem. It is difficult to truly diagnose problems such as these because the systems are so complex that it would take a huge amount of data recording, followed by a person skilled in the ability to read / interpret such data, to really find the problem. It sounds like they are 'shotgunning', firing in different directions with a wide enough blast and hoping to cure the problem without ever actually finding it; unfortunately often the only way a vehicle manufacturer and dealer can often fix these complicated issues.
The very best of luck with the bike and sorry to hear it has gotten so complex and time consuming for both you and them (dealer and Kawasaki); nobody wins in situations like this.
Brian
I'd like to know if any of you have had this problem, and if so, what fixed it. I ride a 2010 C14 ABS with 54K miles. It sat in the garage on a battery tender for the winter. When I went to ride it a couple weeks ago, first ride this spring, the ABS and KTRC warnings flashed continuously. I rode it to the dealership, they replaced the battery, at which time more codes showed up. Per Kawasaki, the meter assembly and the ECU module were replaced. This fixed nothing. Now Kawasaki is sending out a new wiring harness. They and the dealership say they've never had this problem before and they're guessing on what might fix it. Any solutions?