These printers are under high pressure and leaks are common in a few of the junction boxes. There are rubber O rings on most of these junctions....If you see a leak coming from a junction box, a common area is to the right side of the main board, behind the paper lever....just take a #1 phillips head screwdriver and tighten it a bit, that may work. I've seen these junctions rupture from within also. Keep in mind if you are going to replace any of these parts, you need to depressurize the ink system with the service program or you will have a real mess. Pump caps also can clog up and leak as well. I fixed a P20000 yeatrerday that was leaking from the printhead, it tuned out to be the damper assy above the head, not the print head itself....which was good since that head is nearly $3k....