@admin I apperently had the same problem as the original poster of this forum/article. after replacing the EE-SX671 sensor with the spare, the printer started to work and function properly again.

I have a similar problem.
The sensor on the left keeps burning red, and when I gently touch the nozzle, it turns blue.
So I think that all the sensors do work.
However, the auto-level keeps on pressing down.

I am clueless on what to do.