Ever since installing my new tires and Tubliss system, I've had a slow leak on the low pressure side of the rear tire. It held air fine for the duration of a ride, but would lose about half it's pressure every night until zeroing out. I gave it some time, hoping it would heal itself, but it didn't. Not wanting to repeat the entire installation process (as suggested by the Tubliss trouble shooting guide), I removed the valve core from the low pressure side, squirted about ten pumps of soapy water from a spray bottle into it, reinstalled the valve core, aired up the tire, and voilla! no more leak! Even two days later, it hasn't lost any pressure. .