What was found
ON FLIGHT 3241 THE CREW REPORTED, AFTER ONE HOUR INTO THE FLIGHT NOTICED THE NR 1 OIL QUANTITY HAD DECREASED TO 5 QUARTS. THE CREW REFERRED TO THE AOM PROCEDURES FOR OIL QTY LOW. ALL OTHER INDICATIONS REMAINED NORMAL. THE CREW CHOSE TO CONTINUE TO DFW AND MONITOR THE SITUATION. THE CREW NOTIFIED ATC AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REPLACED NR 1 ENGINE AFT SUMP COVER SEAL AS PER RR MM 72-59-10. THE LEAK CHECK WAS GOOD AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.