Left brake light and left front turn signal don't work as such, but the light bulbs work when used for parking lamp and rear turn signal. The left brake light doesn't turn on when the brake is pushed, but the top bulb works when the headlamps are on and the second bulb works for the turn signal. Right side brake light functions normally. The front left turn signal doesn't work but the bulb is on when in park. What can I do to fix this?