Today I noticed a slight rattle sound coming from the engine compartment.

I popped the hood, and it sounds like it is coming from the pulleys on the accessories.

My first thought is possibly a belt tensioner. My truck has almost 30k miles on it now.

Which is low for 2015.

Just curious if anyone else has had this noise and what the fix was.

2015 Cummins 2500 Crew Cab W/68RFE S&B Cold Air Intake, MBRP Stainless 4" W/muffler, MM3 tuner from DRD, XDR Throttle Valve Delete, XDR EGR Delete, Shibby Plug Kit, Traxda 3.5"/2" Lift, 20x12 Hostile Wheels W/35" AMP AT/G Tires.