Ballast Issues

[4nonymous]

Exactly one year ago my left xenon bulb went out. So after swapping the bulbs it showed that it wasn't the bulb itself. So I didnt some research and narrowed it down to the ballast being the problem.

Had this replaced and coded and all was good.

However a year later the left xenon is out again.

I havn't had a chance to change the bulbs over to check a bulb hasn't blown but assuming they are fine, anyone got any ideas why the ballast could have gone again?