Are there iffy contacts in there somewhere? I had one tail light go out a couple of weeks ago, i took the bulb out, found I needed a Volvo specific bulb, put it back and it worked. It went out again later, and I tapped the cluster and it came back on! The other side also did the same a couple of days later, tapped it and they've both been fine since. Both bulbs were from the upper position in the cluster.
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