Jenn Air double wall oven noise. Model JJW9827DDP. After oven heats up for cooking a noise starts. This noise is in front of the oven and seems like it is coming from the upper door latch motor mechanism. Doesn't seem to be the fan since no noise from rear. I already replaced the latch motor mechanism but the problem persists. It doesn't do this on the bottom oven door latch motor mechanism. The latch doesn't engage while cooking, it just makes noise. Any help with what could be wrong