Roland d-5 not initializing

HI All,

I am having troubles fixing a Roland D-5 that will not initialize. In startup I have only some yellow blocks on the display and the led buttons illuminated.

It appear that the reset line is unstable but I can not pin point the culprit.

I have so far replaced:

-The voltage regulator (IC1)

-Caps C2, C66, C68, C3 and C4

Attached is a picture of the Reset line dropping and the Display. Also a link to the Wiring Diagram

Would anyone be able to assist with this as what should I look for next?

Much appreciated