I am hoping to start my Elky this weekend...well that was the plan

I filled the engine with oil and then AFT into the Trimatic. After about 3.5 litres into the Trimatic I looked under the vehicle to see if there are any leaks and to my dismaym there was a steady drip of ATF.
From what I can establish it seems to be coming from the mechanism where the manual kickdown on the box is. See picture attached. Sorry its not a really good picture. Is there some type of seal that i'm not aware of?
It never leaked there before, but it was caked with dirt and grime which could have sealed a leak.
Any advice appreciated.
Thanks
K