Appendix. Detail repair instruction(Based on gas model) 
Service Bulletin 
 3. Open the oven door and disassemble the 4 screws under the manifold. After that, disassemble the manifold. 
 4. Disassemble the black screw on the front of the manifold. 
Black screw 
Product : LG Gas/Elec. Oven 
Bulletin # : CVZ201900039-02 
Release Date : 2020.03.13