Re: I changed out my DRL bulb and noticed this...
There have been numerous reports here. There is a long thread on the subject somewhere. Most also have discoloration of the reflector directly above the bulb.
2011 WK2 Overland Mineral Gray/Black, Advanced warning, V8; 2009 KK Rocky Mtn V6; 2000 WJ Laredo I6; 1979 CJ7 I6... green... miles of smiles :)