Tried to light the gas fireplace pilot for the winter. The pilot lights normally and remote control works properly for a few minutes. Then the pilot goes out. When attempting to relight the pilot the flame goes out when the pilot button is released no matter how long it is held down. The fireplace is made by superior fireplace company out of fullerton, CA and I cannot get any information about them. The thermo couple was replaced in 2007. What is the next step?