Loud Rattling Noises (FAN?) in KitchenAid Double wall oven

will check on model number when i get home but wanted to ask first…when oven is running, we get a really loud fan noise coming from (I think) the space in between the upper and lower ovens. I’m sure something is loose, but i need to get some help diagnosing the problem.
Hopefully its just an old fan that has become loose and worst case, needs to be repaired.
Anyone have a link to troubleshooting guide?
Also, the handle on the upper oven is loose, and i want to tighten it but can’t tell how it’s actually attached.

thanks!

Need a model number in order to be able to see if a service manual is available.