Help please! See photos for a leak on transmission

Can anyone please help me identify what is leaking on my 450SL transmission? I have never touched this part but after doing a trans flush and replacing the filter and on seal, this leak showed up above the pan but I don't know what this is or how to stop the leak appreciate any help and advice thanks

Can anyone please help me identify what is leaking on my 450SL transmission? I have never touched this part but after doing a trans flush and replacing the filter and on seal, this leak showed up above the pan but I don't know what this is or how to stop the leak

appreciate any help and advice
thanks

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