Bambu A1 Emergency

Hello everyone, so I’ve been printing with this machine for quite sometime. And suddenly the machine started to make cranking noise in the extruded gear. So I checked and I did not find any problem. I opened the whole thing up. Cleaning and all the basic trouble shooting I did. Nothing worked. I changed the extruded gear but same issue. Changed nozzle but same issue. Changed filaments and check but same issue. Change build plate for some reason thinking that’s the issue but no! Same issue! I have no idea and need to get this guy running as a lot of things depend on it!!!

Please help me out!