Supercool70

I have a 2009 4Runner Toyota dealer changed transfer case actuator and front differential actuator, because 4-wheel low would not engage, still after installation still does not work. The 4-wheel lights blink all the time in 4-wheel high. Stopped in neutral try and engage 4 low lights blink VSC off 4 Lo light blinks and have and alarm sounding also. Toyota does not know how to fix the problem, and it has cost a few dollars and no results. Hopefully, someone has an idea to solve this problem.