I had to replace my controller recently due to a bad temp probe port. I am now getting a message that I need to change the glow plug soon. I assume this is a time\usage based message. Wonder how it knows the history since the controller was just replaced??? I am reluctant to replace the glow since I have not had any issues with it. I do have 2 spares on hand, thanks Weber! I'm just worried that I will change it and then start having problems, but also don't want to have it die during a cook. Hmmm. What to do?