Obviously you don’t, otherwise you wouldn’t spend all this time on audio forums asking the same question.
without a service manual or a schematic diagram no good technician wastes time to rebuild the diagram ...... time is money all over the world.
Best you bin the TT801 and then all your troubles will be over.
ha ha haa...shure!!
For me the discussion was already closed 2 years ago .... I have not resurrected the 3ad.