Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 40 (click to view)
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Page10-1 : MAIN PANEL TEST
A
Page10-2 : SUB PANEL TEST
For checking the luminescent spots on the sub-panel (black) Check the LCD of the sub-panel. Confirm that there is no colored block remaining.
For checking the luminescent spots on the main panel (black) Check the LCD of the main panel. Confirm that there is no colored block remaining.