Oh boy that sounds horrific!

Hmmmm it's a very slow leak - I wonder if there is a 'bodge' solution I can utilise instead of pulling it apart? Some kind of additive that will 'plug ' the leak or some thing I can apply from the outside to somewhat stem the flow - even though it appear very low as is.

I don't think I've got the skillset to manage pulling that apart - if it's a handful for Norm, let alone locating where to get the seals from etc.

Wonder if something like this is worth trying:
https://www.supercheapauto.com.au/p...65G6zRg-vTMRO2o2Fb6NtNpmSEhQD8&gQT=1
https://www.supercheapauto.com.au/p/lucas-lucas-transmission-fix---710ml/10779.html?cgid=SCA01070703