Same for me. There was a 3mm section of the contact patch on the actual light cluster for one of the bulbs (where the bulb holder screws in and should make contact) which had burnt through. Blob of solder and then filed it flush. All fixed (after cleaning the rest of the bulb holders with wire wool as they were a bit crusty). I like oem stuff, but there are replacement bulb holders on ebay for a few quid too.