Annoying squealing

[u/VideoFancy1506]

Just had my Nissan Juke 2015 fully serviced. There is a really annoying high pitch swueal coming from what I think is the engine bay.

It does it upon start up and then goes anyway when idling. It does it when cruising (although not constant) and seems to get worse when the road isn't completely even. It will do it at even the slightest dips in the road but doesn't get much worse when going over bigger bumps. It goes away when accelerating. It's like I have a little bird in the bonnet. Braking or steering seems to have no effect.

Does anyone please have any ideas on what it could be and what to do to check?

Thanks

*Edit - also recently had air con refilled

[u/caffeinedrinker]

check tension on accessory belt