Bitmain does not publish this kind of data, however, they have some stuff like
this, that has the pinouts and a lot more information, sadly none for T9 neither ETH mining gears, but I can tell you where to get those.
Aliexpress, find a chip seller and ask them for "Repair Manual", they usually provide that if you actually do buy chips or any miner's component from them, that might not be the best solution, but if nobody here has those manuals to share them for free, there is no other place for you to find them, at least none that I know of.