2003 Toyota Sequoia electrical system problems

When we first bought the vehicle the trac system lights kept coming on and the brakes felt mushy; we took it in to toyota and they replaced the computer system which seemed to rectify the problem. Then about 9 mo to a year later the lights kept coming on again and the brakes failed twice, toyota stated they would replace the brake system fluid and the master cylinder at our cost because we had taken it elsewhere and they felt that it had contaminated brake fluid, which our mechanic stated in writing was not.

Vsc/abs/skid light on my 03' sequoia began coming on nov. 06. I went to the dealership and they said it was the ECU skid control computer and reset it. They said the lights might come back on and they have on and off for the last year. Also, noticed issues w/ the break skidding even though I recently had brakes replaced. Now I have to pay $1500 to have the ECU skid control computer replaced and the car only has 62k miles on it. Way to early to start replacing electronic parts.