I have what I think is exactly this squeak. Reported it when it went in for it’s intermediate (first) service last year and was told that they couldn’t recreate it and no problem. It did it again over the winter but the service centre is a two hour round trip (my local garage only do vans, not Californias) so I videoed it on my phone and reported it again when I took it in for it’s full (second) service the week before last and showed and sent the mechanics the video. Mechanic said great and that he’d get it sorted.
When I collected it I was again told that they can’t recreate it and therefore they can’t replace anything or do any work on it as they wouldn’t be able to claim for it under warranty without a clear diagnosis to claim against. The service manager at Breeze told me I would have to bring it back again during Winter and leave it with them for them to be able to diagnose it but as far as they were concerned everything was fine and there was no issue to deal with at the moment. I understand the challenge for them - however not very happy that a two year old £50k van often sounds like the car I had when I was 17 and the entire car cost me less than the full service did for the van!
If there is a known issue then did they give you a reference number or tell you what pulleys were replaced? Did they tell you anything that I can point Breeze at to tell them what to do to fix it?
Thanks,
Jez