user: Question: What is the highest production code when the writer was Brian Egeston after season 5?
Columns: ['Series #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [127.0, 1.0, '"Where\'s the Payne?"', 'Kim Fields', 'Steve Coulter', 'November4,2009', 601.0]
SQL:

assistant: SELECT MAX("Production code") FROM "Table" WHERE "Written by" = 'Brian Egeston' AND "Season #" > 5.0;