You test it for power. Just like anything else. If everything is working. The test light will flash. If the light don't flash then you know you've got a power problem.I replaced the bulb again and we're going on about two days without issue, so hopefully that does it. If not, I've got some great troubleshooting steps here to work through. Thanks, everyone, for your help.
Can you say more about this? How do I do this?