After reading dozens of reviews of this same problem I am convinced that I received a poorly made propane grill like so many others. The fire box which is the only barrier between the flames and the propane tank disintegrated into a pile of rusted flakes leaving a gaping hole through which flames can reach the propane tank.
This is a serious safety risk. I found online that Sears has admitted that this part rusts out prematurely and has even offered to replace the affected parts in 5 of these grill models. Unfortunately, they used the same cheap metal in more than 5 grills models. Mine looks almost identical to one of the covered grills.
In fact, the model numbers are only off by one number. My previous grill (not a Kenmore) lasted over 10 years before I sold it during a move.
I took excellent care of that grill too. Grilling a burger should not be like playing Russian roulette.
Reason of review: Bad quality.
Monetary Loss: $350.
Preferred solution: Repair the defective part at no charge or provide store credit for purchase price..
Sears Pros: Price.
Sears Cons: Poor quality, Lack of product support.