My girlfriend has a 91 legend coupe and is having a couple problems. First, and most important, the ignition switch is sticking. It has been doing this for about 6 months but you could always get the key to turn if you played with it. Today, the key won't turn at all.....she tried for about an hour. Do we just need a new key switch? How hard would this be to install? Also, after she turns her car off and shuts the door, sometimes the interior lights come on and dim intermittently a few times then they stop. What could this be? Also, what other little problems should I be aware of with this car? Thanks, Josh