i got 2 hashboards back from bitmain that we sent for warranty repair a while ago, they came back with some transparent glue in one corner, anybody have a clue what this is? they are both like this....

http://puntoweb.com/~pics/s7-1.JPG

http://puntoweb.com/~pics/s7-2.JPG

any comments?

they seem to work just fine....