One of the signal heads is acting up. When it is red, everything is fine. When it is green, the yellow light also lights. This is part of the cycle for this item, yellow for about 10 seconds before turning green. I have swapped the head to the other location on the signal and to another signal elsewhere, the problem is isolated to this signal head.
Is this something that can be fixed? If so, what do I look for. Otherwise buying another pair is a good excuse to visit the hobbyshop.