I agree with you raymond - I think when he swapped the bulbs the side that previously was dead worked again. This should point to the bulb being bad.

If this is the case - call Phil - I don't think you'll find the xenon bulb at your local walmart/auto parts store.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE