Hi Weldon,
You say the heater is instllaed in 2004, I found the following link, your heater has 6 years warranty on parts and the tank, it doesn't hurt to call sears and talk to them, see what they say,also open the 2nd link it is owner manual will show where to set your gas valve, and if need any more trouble shooting good Luck.
John
Kenmore Power Miser 6, 40 gal. Gas Water Heater - Model 33064 at Sears.com
http://c.sears.com/assets/own/33064e.pdf