Why don't you contact Accuphase directly and ask them ?
Accuphase DP-78 doesn't read SACD layer
I have a Accuphase DP-78 SACD player that will play pure SACD's, CD's, and will play the CD layer on a Hybrid SACD but no longer picks up the SACD layer. Has anyone come across this? I tried air blowing the inside was not successful. Any Suggestions? or can you suggest a reputable NJ or metropolitan area repair?