I had read somewhere that they started using better PSU but I don’t remember the source and I don’t know around what date it would have changed. I also asked the question on a thread in Dec 2021, because I was considering ordering a new PSU to replace mine quickly if needed, and the answer I got was from
@_AV (who is well known on the forum for repairing them and other electronics) is that there are some anecdotal encounters that the newest eb832 that have a UL sticker on the back may have a better meanwell PSU.
I wish I remembered the source of the more definitive answer but it’s been probably close to 1.5 years ago that I started trying to find out.