All that info is available in the lengthy Modding the DirectStream DAC thread. You only need to read through the past year’s worth of posts to find descriptions of the specific mods the DS Dac’s designer, Ted, recommends as being worthwhile along with many member’s accounts of sourcing the necessary parts, performing the mods, and the sonic end results. The contents of that thread are a far more useful resource than any single person’s experiences.
If you live in Southern Ontario and are triple vaxxed, you would be welcome for a (masked) visit to my home for a several hour visit. FYI though, I have only performed the Edcor output transformer mod and the JK Richards plug n’ play power supply board which an outboard analog LPS. There are several other mods with “audiophile” fuses, Furutech chassis mount IEC replacement, etc that I have not bothered with.