We occasionally find black liquid on and around the fans that cool the circuit boards inside the carriage. The one that has the most liquid is the fan on the right side of the carriage. It has also sprayed the black liquid on the circuit board. Has anyone else ever seen this? I have a couple pictures. This doesn't make any sense to me. We change the filters frequently. We change the filters even when they don't look that dirty. We have been told that it is ink being pulled up there by the fans. If that's the case, why is it only black. We print white also.