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check the shape of SD0-SD3 UF8 11-14 and the same for UF7 pins to see if they are nice clean 0-4V square waves
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Those pins (four from UF7, four from UF8) go to the eight inputs on UF9 and Colin says he has steady high on all of those.
Doesn't mean that it is not also worth looking on UF7 pins 11-14 and UF8 pins 11-14 but it's hard to imagine where all 8 of those signals would go missing on the way to UF9.