I had to turn the heat down (didn't want to lose all that hot water!!) and took the top off. What on earth happened? I peered into the water (avoiding the steam!) and lo and behold the screw that held the locking mechanism on was in the bottom of the PC!! NO!! I used some tongs and reached in and grabbed it. Using oven mitts I screwed it back on. Then had to restart the PC. All that time lost!!
Here's what it looks like apart.
So, I finally got the rest of the sweet potatoes done. Learning point in this? Though I always check my seal and gauge I had not been checking this piece!! I will now!! Be sure and check all connections, screws, etc. prior to using your PC every time!! Lesson learned!! Have a great day everyone!!