Help me diagnose this noise please?!

[The Bear78]

Afternoon all,
My 2016 EU5 140 occasionally makes a strange warbling noise. It seems more prevalent when warm and most noticeably during re-gen. To me it sounds like a pump cavitating but could be a number of things!
It tends to occur on a light throttle or during deceleration, rarely under load but doesn't appear to be predictable.
Anyway, I have a clip of the noise while driving around a private car park. 1st gear, light throttle and the van is in the middle of a regen'. I had thought it was a sign of something worn but as you'll hear it can manifest itself in a regular pattern, in the clip it seems to alternate between the warble and the injector clatter. Maybe a fuel pressure regulation issue?...
What do you knowledgeable lot think?
T6 Noise - YouTube

 

[Loz]

Might be the air control solenoid that operates the turbo. Used to be called the N75 or "Moo" valve.

 

[Deaky]

Sounds normal to me. Mine makes the same noise when it's regening and the engine is idling. Sounds like an old washing machine going round.

 

[The Bear78]

Thank you both.
It doesn't seem to be getting any worse of affecting performance so I'll just monitor it.

 

[Kallaskalle]

I have the exact same sound, same engine, did u found out what’s wrong?

 

[The Bear78]

Hi. And no!
I can only assume it is linked to the regen as per the above replies. It hasn't got notably worse so I've just accepted that it happens.

 

[Kallaskalle]

Have u solved the problem? My wierd sound is still present. No breakdown yet.

 

[Gavinda]

Have u solved the problem? My wierd sound is still present. No breakdown yet.

I'd say that if it hasn't got worse in nearly 18 months, it's probably nothing to worry about.