Turn signal ?
So I agree, the easy check is the bulbs. The contacts for the bulb could also have become corroded over time, not allowing enough current to flow to the bulb.
When I did my rears, I changed them all at the same time. They were all the same age, after all, and would have failed soon anyway. And clean the contacts when you do it, they will have at least a little corrosion on them.
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