congrats on the new car and welcome to the forum,
there must be a broken seal on the light (hopefully not a cracked lense)
if it is the seal there is a method use , by putting it in the oven at said temperature it lets you open the light up allowing you to reseal it with some sort of silicone substance and then putting it back together.
theres people that have done this and they might be able to fill in the details
have fun driving the Z
Paul