488 Can you help me find the rattling?

I’ve had this rattling sound coming from behind the seats. (I think) Sounds like from engine compartment. But maybe it’s from the interior behind me? . More pronounced at low speeds and 1st or 2nd gear, especially if you are at lower rpm. I have a Spider so I can hear it very well , not sure if gtb owners have this issue but simply don’t hear it as they don’t have the top down.

I don’t think it’s an engine issue as it doesn’t increase with more speed or rpm. Same with suspension. Would,think it would increase at higher speeds

it’s used to be intermittent. But now it’s almost every time when I first drive the car, then seems to diminish the longer I drive it.

Wondering if any of you can tell me of similar rattling issues that you solved so I can check those. Not sure how to diagnose this.

taken it to dealer several times and even had to pay for diagnosis and they can’t find it. One time they said it was low power steering fluid, but that didn’t solve