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Does anyone know why there is a discrepancy between the service manual stating that connector J5 has 12 pins? (chapter 6 table T-6-20)
The actual board connector only has 8 contacts in it's J5...

I realize your issue and post is quite old but were you ever able to resolve this issue? You mentioned purchasing a new opto-sensor, did that help?
Did new Main Controller board solve problem?
I...