I have a Frigidaire convection oven, model KGSS907SSS00. The front left burner has a dual mode. Inner circle on the burner (for igniting and low flame) doesn't get any gas. Outer circle (high flame) does. I removed the dual valve and determined both are working fine. I blew through the gas line connecting to the problem inner burner and determined it is blocked.
I've tried blowing compressed air from both directions and remains blocked. I tried running a small wire hose-cleaner type of metal brush down from the valve side and it reaches the blockage and can't clear it. Trying to run the brush from the burner side hasn't worked. I sprayed solvent and no change.
Removal of the top panel on the stove is complicated by the fact that all the burner bases are secured by very corroded screws. I already sheared one screw even after applying penetrating oil and giving it time to work. If I have to go the route of removing them I can but am hoping to avoid if I can clean the blockage in place.
Any recommendations on how to clean the line out without removal?