The panel is held in by one spring in the front, and two arms in the back. It is a little hard to describe, but the little arms pivot on pegs and can be rotated down, which releases the rear and the panel is pivoted out.
Installation is the reverse, rotate out the little arms, insert back first and the spring will catch the front.
I have had the panel out but dont remember where the bulb is, it probably is a unique bulb so get one ahead of time. I dont know what a dealer would charge, its easy once you have seen the proceedure!