Hi Michelle! I removed the throat plate again to have another look. I can't really see where the sensor is, and to be truthful, I'm not quite sure what I'm looking for .... When the problem occurred a couple of days ago, I did do a thorough cleaning, removed the bobbin holder, etc. I've been cleaning the machine very regularly since I've had it, so there was very little lint, no caught threads. I'm still waiting to hear from Juki. Sent my contact a follow-up email this morning.