XPS 8960, PSU, loud metallic rattling noise

Bought my XPS 8960 back in July 2023 and from the start there was this intermittent and extremely annoying metallic rattling noise coming from the PSU in the bottom of the machine. I put up with it for a while, but it started to get louder and more frequent.

Got in touch with Dell CS who, due to my irregular working pattern agreed to send out a replacement PSU to install myself.

It was only a 5 minute task and very easy, but the new (actually refurbished) unit was actually louder, so removed it from PC boxed it up and returned it back to them and reinstalled my original PSU.

Contacted them again to report what happened and they sent out a technician to do exactly the same as what I had done. In fact I actually knew my way around the PC better than the tech, who to be fair was a bit feckless.

And he was supplied with another refurbished unit.

Guess what? Same exact issue about an hour after the tech left, so I gave up trying at that point until a couple of days ago when the noise started getting louder, a lot more frequent and lasting for longer periods.

Contacted Dell CS again who have agreed to send out another tech but I know they are gonna send out tech with yet another refurbished unit and I'm beginning to think that all these refurbished PSU (which have been "LiteOn" branded units) are from systems that people have complained about noisy PSU and Dell are just trying their luck in getting rid of them.

Absolutely TTP now though as I've spent countless hours trying to sort this out and still no resolution. Even mentioned the numerous threads on here where this has been happening for well over 18 months with other customers and that other have identified the LiteOn 759w PSU as being the culprit, but it just falls on deaf ears.

Anyone else had a XPS8960 or even the previous XPS8950 (which some have had the same problem) and had any satisfactory resolution?