Here is a site that will list all the recalls and known problems with the Bonneville. Its a U.S. governments office of defects site but it should apply to a Canadien models also. I use this site a lot before looking at used cars, it lets me know what other people have had problems with. It says that this site is for safety concerns but it has a lot of the known problems also.
http://www-odi.nhtsa.dot.gov/cars/problems/
I wouldn't take these complaints to seriously just look for the things that people have complained about and check for them on the car, don't let the stories stop you from buying this car, the engine is one of the best, have just about 321,800 kilometers on mine and runs just as smooth as it did at 80,450.