96 acura rl windows on 1996 Acura RL

the back windows to my 96 acura rl wont work. how can i diagnose and fix the problem.

3 answers
new motors from a junk yard
the motors, new are about $160/ not installed. they are part of a dealer service bulletin. apparently all cars are affected in that year. normally the rears go out first. dealer may fix it. check for bulletins
here is a link to a repair manual site that is really good, there is a small fee.

http://bit.ly/mitchell_repair_manuals_online