I am not sure of the model number of my Garland gas range (propane) I bought it in 1970 from a farmer who had purchased it at a restaurant sale. It is OLD. (so am I) I have had trouble for years with the ovens going off at times and not relighting immediately. The right oven especially.
In the last 35 years I have had the thermocouplers replaced twice, the safety valves twice, and new pilots twice. The last time these were replaced was 6 months ago by a repairman who said this was the problem. Very spendy. The ovens still would go out. I had a thought (and related it to the repairman) that perhaps there wasn't enough air circulation to the oven burners (the top burners and grill worked fine) He said there was plenty of air getting to the ovens. Two weeks later I had my son help me move the stove out another 4" from the wall and I have not had one bit of problem with the ovens since.
You can buy new fire bricks for the grill at a heating shop. I am having trouble with the thermostats now, they don't regulate the ovens to coincide with the settings. I will have them replaced next.
Every one thinks I should just get a new stove. No way. This is a great old stove, I love it.