I noticed a touch of condensation building up inside one of my headlight assemblies. This is a 2012 300C. I replaced the ballast a few weeks ago and hate to remove the bumper again and try to get rid of the condensation.
Question, if I drilled a tiny hole at the bottom of the assembly lens would that help dissipate the condensation?

 

IF there was not condensation there before you replaced the ballast then you made the hoe to where water gets in.