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I had a HID ballast go bad on my 2008 Mercedes E300 (W211) recently and replaced it. It's a Bosch 5DC 009 060-00 (Mercedes A 211 870 90 26). Bosch HID ballast 5DC 009 060-00
Using a Dremel tool, I tore apart the defective ballast to see what was inside, out of interest. The link below is a high res photo of the circuit card inside the unit.