I did a SEARCH on this player and found about 50 threads posted to date. I would think at least 1/3 of them have to do with upgrades, mods,etc... Did you look at the archives before you posted?
As an owner of this player for the last 6 months, there has been much talk in the forums. To Mod or not to mod? That is one of the questions for sure. Which Caps, Which Power cords, Which tubes,what about......well you get the idea.
I will say that Im in the camp of "minimilist mods possible" to this already sweet player. May I suggest the following:
Change the stock tubes to something like the Mullard 12AX7, RCA 5751 Black Plate, or my personal fav being the Yogoslav Ei Gray Plate ECC83/12AX7. Then stick a decent PC on the back and lastly....put it something like a nuance shelf to control resonance and Buddy...your done. My ears have heard 2 of the mods avail, and I feel they rob the player of its sweetness at the cost of some dynamics and a more linear SS sound.. This IMHO. Good luck!