CREATE TABLE table_74358 ("Series #" FLOAT, "Season #" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Prod. code" FLOAT, "U.S. viewers  ( millions ) " TEXT)

What was the production code of the episode directed by Rondell Sheridan?
SELECT MAX("Prod. code") FROM table_74358 WHERE "Directed by" = 'Rondell Sheridan'
SELECT MAX("Prod. code") FROM "table_74358" WHERE "Directed by" = 'Rondell Sheridan'