Ok so there's a possibility that the firstmost pin on the 10 pin connector goes to INT2/P72 but for the most part the others seem to go nowhere... 2 others seem to go to a power switch of some sort? (they seem to lead to a chip called SE191 which as best as I could find is some sort of power switching thing, but idk) P72 doesn't explicitly say serial anywhere but Im not familiar with the language used in the manual so I'm not sure.