904 Goo in pan

Hi everyone , bought a used 904 was supposed to be rebuilt ,was used after rebuild, but there is some strange goo in pan and some water droplets in oil , only had a little trans fluid in it and seems dark , doesn't smell , but looks suspicious , jut looking for some opinions on possible goo, its not metalic , not chunky and does wipe into a paper towel, trans1.JPG trans2.JPG trans4.JPG

trans3.JPG