Service manual or how to take apart a Kenmore 790-75??? Gas Range?

We have a Kenmore free-standing 790-75??? Gas Range. Some sice spilled in the bottom and went down underneath where the burner is. A fire started there, which we put out. I cleaned it out as best I could, started the cleaning cycle, and flames came out again. I think we need to get underneath and get out whatever is burning. I can't use the oven or clean it for fear of flames. What I'd like most if a service or repair manual. Can anyone help?