Hi, I just moved into a home that has had everything completely redone. The seller of the home claims that all of the plumbing has been redone as well. I'm having a problem with the washing machine backing up into the kitchen sink, and causing the toilet to bubble as well. Then a few minutes later, water will leak from what seems to be the bottom of the water heater. It's not coming from the valve/tube. I have no idea what is causing this problem. Any help will be greatly appreciated! Thank you!