Bangraman,
Don't make me break out my camera! I still have the orignal box and manual packed away. Might still even have the box for the RM-DM1K. The BP-100 died years ago.
Larger coupling caps were fitted to my D-555 so my thoughts are somewhat skewed as well. The original 6.3v100ufd were all bad and two were leaking, literally and measurably, (even the one in the power supply) so the opportunity was taken to replace with larger values. SMD caps have increased greatly in quality over the past 15 years.
Admittedly, some don't like the D-555 sound and characterize it as: harsh, brittle, digital, etc. I find it quick, detailed, and powerful -- not harsh at all. I can truly hear fine detail that is obscured in other players. Of the modern PCDP, the D-NE10 is my favorite -- the sound is quite good, in my view (for a 5mw player).
Paul