Transmission oil leaking?

The last two times I changed my oil, I noticed some oil residue in the transmission oil pan (I think it is). I checked the auto trans dipstick and oil is in the right level. There's no oil residue dropping in the inside of the plastic cover either. I'm guessing this oil is leaking slowly. Anybody knows what is this or what's it causing it? Thanks.
 

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Looks like the drain plug is slowly seeping or the person who last drained the fluid never wiped off the pan. Wipe it all off and clean it dry. Then you will be able to tell where it is coming from.

Starting fluid (ether) is great to clean up oily stuff.
 
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