You could try swapping sides on the lowbeam bulbs...that'll narrow whether it's bulbs of ballast. I'm stumped on the AE'd though as they're regular incondescent bulbs.

OEM Phillips bulbs can be had for under $100. If you're still rockin the original bulbs I'd replace those regardless as by now they're going to output about half (or less) the amount of light new ones will....not to mention by now they've undoubtedly color shifted beyond the 5000k range (slight blue hue).

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