One of my buddies has a C43 and his right side xenon light lights up blue like the left one but after two minutes turns into a yellow light while the left stays blue. Can anyone tell me why? I'd like to help him out. Thanks in advance for your help.

__________________
94 E500 Sport
SOLD:
2002 BMW M3 Coupe 6 Speed.
SOLD:
92 500E Black Pearl, Black.
18" 2 Piece AMG
ASR Defeat
Performance Chip
Crossed Drilled Rotors.