Need advice on modify BADA HD-21 (Brother 摩機鄺 pls help)

Brothers,

May i know whether modify the HD-21 same as HD-22?

If i would like to change the capacitor step by step (not a the same time) which cap should i change 1st (which cap will give more effect after change?
1) the 2 cap near power supply (220nF or 0.22uF) OR
2) The 2 white cap (2u2,400) or
3) the SCR cap?

Just attached the original circuit photo on this player.

hi, WINDWSS

試下加個DAC, 我朋友買部MHZS CD-88犘電容和IC, 最後都輸比部２千元DAC

ok, thanks for advice.