The cache is not at the noted coordinates, but it's not far. You have to solve the following puzzle to determine the coordinates. You'll need to get a little geeky for this one.
255-255-0
0-0-0
-
0-0-0
102-51-0
-
255-165-0
238-130-238
.
102-51-0
0-128-0
-
-
102-51-0
0-0-0
0-128-0
-
102-51-0
255-255-0
-
102-51-0
0-0-0
.
255-255-0
0-128-0
Good luck! ...and bring your own pen.