Okay....so the replacement PS fan I previously mentioned turned out to be a sleeve bearing fan and soon started making even more noise.........That's what I get for not reading closely....So....I did the Noctua A9x14 fan mod as shown in the Facebook group (credit to Art Baldwin who did the heavy lifting on that mod). Since I was going to be really modding stuff, I started playing with the hot end. I found that the most noise was coming from the part cooling fan. It would make a rubbing/grinding noise on startup. So I ordered this replacement fan: https://www.th3dstudio.com/product/4010-ball-bearing-fan-24v/ which is the same size / voltage as the stock one. I did have to go to shorter screws to mount it as the mounting boss on the stock fan was a bit thicker, leaving the new fan a bit loose when the screws bottomed. This replacement fan seems to put out a more air flow over the stock one. Interestingly the heat break fan is tiny, which I usually associate with LOUD, but mine at least is dead silent. Surprising, but welcome! For the part cooling fan, the wire colors are Blue=ground and Yellow=positive. The Noctua A9x14 in the power supply is super quite. I printed the new power supply cover in black and since I already had my printer on some riser feet, not a big deal to fit. I really wanted to reduce heat in the power supply with this mod. The stock fan is TINY and with the outer power supply cover in place, air flow is frankly bad. The stock outer cover has an intake grill for the fan, but NO matching exit for the heat? It should have some slots or something for the heat to exit the area. Since the A9x14 mod ditches the outer cover and replaces the power supply lid, air flow is greatly improved. Anyway, that's my .02 cents.
Overall, this effort dropped the printer from 54db when printing to 49db when printing. The loudest fan is STILL the part cooling fan, so there is still some improvement possible, but -5db isn't a bad result at all.