I'm looking to replace some of the lights and heard that led's could be used. Is that true? How difficult is it to access the light fixtures to replace them?

 

Yes, its very easy to change out the light bulbs to LED's. check out ebay for cheap LED's.

Here is a guide that you can check to find what bulb fits.
http://www.sylvania.com/ConsumerProd...RG-Results.htm

Also, each light is covered by the plastic housing. They're held on by clips. take a butter knife and a cloth. wrap the tip of the knife with the cloth so you dont do any damage while prying on the plastic.