my duo r from doujindance has been fine since i got it a couple of years ago - i use the PS1 Slim power supply - never had a problem with it - I've never opened it up so I'm sure its the same or similar to everyone else's as far the brown gunk goes - guess i will find out someday - anything i get moving forward will be from this forum - i bought a very nice briefcase unit from Keith Courage here - very nice work!