Found oily water (about 1/4 cup) on bathroom floor in TAB 400. Wiped it up. One week later (today) observed more (albeit significantly less). My first thought was leaking Alde pipes in bathroom but the liquid is clear and not colored --I understand that the Alde liquid is opaque and colored. The "oil" character of the liquid is unmistakable. Looked in Alde compartment - no evidence of leaking there. Any ideas? Thankfully, still under warranty.