Creaking noise from heat sink?

Basically I get a creaking noise from below the battery. Kind of sounds like a loose low voltage wire arcing or on a concrete pad with the kickstand down rock the bike and it makes a similar noise. Makes the noise with the bike on or off but I have to at least be going 3+mph. Hard to reproduce when just sitting.

I took the bolts out of the heat sink and the noise goes away when I ride. I cleaned all the dirt out which wasnt that much and still get a little noise but it is quieter now. I looked back on top of the heat sink and I see nothing loose that could be arcing. Im baffled I guess my next step might be to cut some rubber strips to sit between the heat sink and frame and see if that does anything.

Forgot to add. 2023 FX with 1300 miles.