Citroen Squealing Issues?

Hi there, I have a 52 plate Citroen Picasso and it has recently had a cambelt change. I have noticed there is a squealing sound coming from the cambelt area on idle, but it disappears when throttle is applied. Any idea what it might be? Thanks
When the vehicle is warm it doesn’t squeal at all.

It could be just an idler adjustment and that is why it goes on throttle…bit it is best to see your dealer or where yo had the cambelt done..

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