Had to replace several bulbs due to water leaking in the headlight assembly. I took the assembly apart once and cleaned them thoroughly, then glued them back together with J B WELD (epoxy). This "fix" lasted only about a year! Now they are leaking again and have turned yellow. Now the only solution I see worthwhile is to replace the whole assembly with new lights. I can't see very far in front of the car at night and I consider it a safety hazard which General Motors should be held responsible for. There should be a recall on all GM vehicles using this type of light assembly.