I would start a DIY with a new transmission conductor plate along with a fluid and filter swap.
While you are in there, change the potentially leaking connector too.
I think you can get a good kit for this from FCPEuro, here's one offering that includes the fluid :
https://www.fcpeuro.com/products/mer...IaAunyEALw_wcB

( I used the Pentosin fluid myself 2 years ago, still running fine )