Prius (Gen 2) :: ABS, VSC Yellow Warning Lights Came On / Rust On Rotor

Last week I bought a 2006 Prius. Two days later I heard a noise brought it to a Toyota dealer and they replaced the right front wheel bearing. The noise stopped. Then about 40 miles later on an interstate the General, ABS, and VSC yellow warning lights came on. I to it back to the dealer (the lights went off when I got off the interstate) and they cleaned an external connection and but said there could be some grease inside and the light could come back on but it was safe to drive. I proceeded and the light came back on. The lights stayed on while driving it about 1,000 miles home.

Then in the morning after the lights came on after driving it about 15 miles, I again to it to a Toyota dealer and diagnose the lights and a little to fix it, Ten 5 miles down the road the lights came on again. I drove back to the dealer and they said something like: "There is a lot of rust on the rotor etc. that probably was loosened when the wheel being was replaced and that is interfering with the speed sensor. And that the knuckle has swelled.