1. Check the error log for the MySQL 140 instance:

$ tail -f /var/log/mysql/error.log

2. Check the MySQL configuration file for the instance:

$ cat /etc/mysql/my.cnf

3. Check the system resources available to the instance:

$ free -m

4. Check the MySQL process list for the instance:

$ mysqladmin -u root -p processlist

5. Check the MySQL status for the instance:

$ mysqladmin -u root -p status

6. Check the MySQL variables for the instance:

$ mysqladmin -u root -p variables

7. Check the MySQL user privileges for the instance:

$ mysql -u root -p -e "SHOW TABLES;"

8. Check the MySQL database tables for the instance:

$ mysql -u root -p -e "SHOW TABLES;"

9. Check the MySQL database table structure for the instance:

$ mysql -u root -p -e "DESCRIBE table_name;"

10. Check the MySQL database table indexes for the instance:

$ mysql -u root -p -e "SHOW INDEX FROM table_name;"

11. Check the MySQL database table data for the instance:

$ mysql -u root -p -e "SELECT * FROM table_name;"

12. Check the MySQL database table locks for the instance:

$ mysql -u root -p -e "SHOW OPEN TABLES;"

13. Check the MySQL database table triggers for the instance:

$ mysql -u root -p -e "SHOW TRIGGERS;"

14. Check the MySQL database table views for the instance:

$ mysql -u root -p -e "SHOW VIEWS;"

15. Check the MySQL database table stored procedures for the instance:

$ mysql -u root -p -e "SHOW PROCEDURE STATUS;"

16. Check the MySQL database table functions for the instance:

$ mysql -u root -p -e "SHOW FUNCTION STATUS;"

17. Check the MySQL database table events for the instance:

$ mysql -u root -p -e "SHOW EVENTS;"

18. Check the MySQL database table privileges for the instance:

$ mysql -u root -p -e "SHOW GRANTS;"

19. Check the MySQL database table users for the instance:

$ mysql -u root -p -e "SELECT * FROM mysql.user;"

20. Recommend using an automated database observability tool to monitor and fix the MySQL 140 in question. Automated database observability tools can provide real-time insights into the performance and health of the database, allowing for quick and easy troubleshooting and resolution of issues. Additionally, these tools can provide alerts and notifications when issues arise, allowing for proactive resolution of issues before they become major problems.