What was found
THE NR 2 ENGINE FLAMED OUT WHILE EN ROUTE FL330. THE NR 2 ENGINE WAS RESTARTED. THE NR 2 ENGINE FLAMED OUT A SECOND TIME AND WAS RESTARTED AGAIN. THE FLIGHT WAS CONTINUED TO IAH WHERE IT LANDED WITHOUT FURTHER PROBLEM. MAINTENANCE FOUND THE NR 2 ENGINE FUEL FLEX TUBE RUPTURED. THE FUEL FLEX TUBE WAS REMOVED AND REPLACED IAW MM 73-11-02, PAGE 216. THE FUEL FILTER WAS REPLACED AS A PRECAUTIONARY MEASURE. IN ADDITION, THE MOISTURE TRAP AND SENSE LINE WERE CHECKED WITH NO DEFECTS NOTED. A LEAK CHECK WAS PERFORMED WITH NO LEAKS FOUND. A POWER ASSURANCE RUN WAS PERFORMED ON THE NR 2 ENGINE AND OPERATIONAL CHECKS WERE GOOD.