Got in touch with Ray today and he said I should drain and replace the oil in that high pressure pump. He said the water mixing is a result of the cold lines and warm pump creating condensation that builds up over time. Apparently, I'm supposed to drain the oil in that pump every year, but I missed that. He said that he's never had one of his pumps fail when users drain the oil yearly, but had I left it for years, it would eventually have seized.