I had an Exterminator take a look at and smell the odor. They are convinced that it is not an odor of a rodent or dead animal. Everything looked good to them. Does not smell like sewer. They also can not define the odor.
I did take apart the hose from the dishwasher to the disposal and found some debris stuck in the hose and cleaned with a snake and bleach and multiple dishwasher cycles. I decided to cut the cabinet floor open, all clean, I then pulled out the 2 pvc kitchen drain pipes. I then pulled out the Disposal. I pulled out the instant hot dispenser. I pluged up the sewer drain holes and have the cabinet empty except for water hoses and dishwasher hoses. I still have the odor but can't define it. Need some new ideas?