Canon IPF710 Hardware error 03130031-2618

I got a used Canon iPF710. The printer worked well at purchase. After I printed a few posters, the error code 03130031-2618 appeared on the screen. I shut down and turn on a few times, but the code still there. Cannot open Menu or do anything. I did some research online. Someone suggested to check the ink line. I did it and didn't see any air inside.

I was thinking about cleaning the printhead, but since I cannot turn on Menu, I cannot take the printhead out.

Please let me know what should I do to either remove the error code, or open Menu to replace the printhead.