So, I've had my Honda for about 3 years, and I have never had any technical issues. Even this isn't anything to call home about, but it's something that I'd like to fix before it could potentially become an issue. My car is at just over 115,000 miles, and it's started making this kinda, tinky noise under the hood. I've isolated it to the left side of the engine bay, and I'm almost certain it's coming from the serpentine belt array. I've looked up videos of what I think the noise is coming from, but I haven't come up with anything. I have a feeling that I have a bearing going out, and I'll need to replace my idler pulley. I don't have a video of the noise, but it's only when I start my car after it's been sitting for an extended period of time, it'll start rattling, and it'll quiet down after a few minutes, but it hasn't ever gone away. If anyone has had a similar issue, or knows (maybe?) generally what it might be, I'm open to any suggestions. Thank you!