Here are a few questions about the solution to the described error:

1. What is the vacuum suction machine code?
2. Can you provide more details about what is meant by "abnormal" in the context of the left suction nozzle?
3. What are some possible causes of
M7057 error in vacuum suction indicates abnormal behavior in the left suction nozzle of the rear section. To fix the error, inspect and clean or replace the nozzle as required.