The dealer doesn't have the code for the radio. It is set by the owner. If your car is pre-owned, the previous owner should have given it to you. You should consult your manual regarding how that feature works.
The right side foglight bulb can easily be replaced. There are only three screws you need to open, the two on top and the one on the side. Once you open up these screws, pull the foglight out by holding to the lower part and pulling. Again, your manual shows how you can do this. If you don't have a manual, get one for free by registering at Lexus.com.