Hi,
The wire colours are not at all clear on my scope as they are faded, plus some have 3 colours the white insulation.
If it helps:
looking at the bottom of the scope with the cover off, screen to the left of you-
There is a group of 5 wiring pins and a group of 3 wiring pins on the Y-amp PCB. From the side of the scope:
1.White Red Black Black, goes to Red wire on pin on black plastic block.
2.White Brown Yellow
3.No Connection
4.White Red Black Black, goes to Brown wire on pin on black plastic block.
5.White Pink (?) Orange Brown
1.White Black Brown Orange, disappears into the wiring loom.
2.White Violet Violet, disappears down side of black plastic block.
3.White Pink Black Brown, goes to 'feed through' in steel chassis, to Green ground lead/plug
NOTE: these colours are not definite as they are very difficult to determine.
As I said- if you need the schematic or a better photo, just ask.
Good luck, BT
PS Repeat after me- "I must note down wire colours and take pictures with my cheap camera before disconnecting anything..."