Desaturated Export For Single File - All Colour Profile Settings Look Correct

Hi,

Could someone please take a look at the attached file and see if they can identify my problem?

For this file only, I'm experiencing noticeable desaturation of colours when exporting to JPG or PNG, or even when opening the file in Photoshop as an experiment. My Colour Mode is set to RGB, Working Space to sRGB IEC61966-2.1 and Profile to Working RGB: sRGB IEC61966-2.1, using Illustrator v29.8.2 but also having the same results on a different laptop running the latest version.

I've done a fairly exhaustive search online with no change in the export, and even converted all objects in the file to RGB - still no luck. If I open an independednt vector file the exports are fine, so it seems like an issue with this file only.

I've converted the file over to Photoshop and upped the saturation a touch, where the exports mirror what I'm seeing on screen but I'd prefer to work with it in Illustrator if at all possible.

I've had to change the file extension to PDF to be able to upload it for some reason, but assume it could be changed back at user end.

Many thanks.