I checked the fans/PSUs last night for proper airflow by taking a piece of cardboard and putting it between the two switches to isolate the exhausts. From what I can tell from this super accurate and by no means silly test, the fans are operating at roughly the same speed/CFM on the low fan setting.yeah I would definitely open it up and look inside, especially if there's an identical switch above it running much cooler. the PSUs are responsible for most of the airflow, so I would visually inspect those and feel the air coming out of them and see if it's roughly the same airflow as the switch above it as well
I haven't gotten a chance to take it out of the rack, yet (why couldn't this have shown up while I had it on my desk instead of installed in my rack, buried under a berjillion ethernet/fiber cables?), but I'll do that tonight
Thanks for your help, foh.