Do replacement funds for a Non O retirement visa extension need to come from outside Thailand if the balance drops below 800k but above 400k?

For the extension of stay under a Non-O retirement visa, there is no requirement for funds to come from outside Thailand. However, the account balance must be 800,000 THB for at least 2 months prior to the application and for 3 months after the extension is issued. For the remainder of the year, the balance should not drop below 400,000 THB.