I have had a leak for the past two month from my 'bathroom/bedroom' sink to the under storage just beneath. When running water or releasing water from stopped sink, water runs straight through. PVC and hoses seem intact. Repair guy has made two attempts to fix but problem not resolved. Have been searching online for a schematic of plumbing layout to help troubleshoot, but have been unsuccessful. Also seached TOOLS here for complete Owners User Manual. Does not exist for 2009 Heartland Big Country. Any suggestions where to find schematic or manual. .. or any similar problem resolved???