Working with a HS with a sensor+ 96 rack. Last year converted over to all LED fixtures. Third electric is not functioning. Third electric relay in the rack shows no lights on the signal or power. Reset the breaker switch has no effect. Swapped in a known good relay. Shows no lights for signal or power. Flipping the breaker switch gives a momentary flash of the power light and you hear the relay cycle and then shuts off, no Lights. Put the first relay in the swapped location and functions fine. Any suggestions of what to look for next? Thanks