I had to do this too while I was deep cleaning the extrusion gears because they were not gripping filament tightly enough and gave me errors. I removed the gears and cleaned with wire brass brush and compressed air. The bambu A1 and A1 Mini wiki maintenance and troubleshooting diagnosing pages are excellent and with great photos. It's not as intimidating as it seemed after doing these steps myself. I check the tightness of those heater element screws from time to time (there's 7 screws altogether, including the 4 on back side of the heater stone).

Oh my God thank you !!!! I saved this video and this helped me out with my A1 extruder. Thank you so much for posting this video I've looked and I've looked. Thank you thank you thank you.