What was found
NATURAL GAS / ROTTEN EGG SMELL DETECTED MOMENTERALLY ONCE DURING CLIMB, TWICE DURING DESCENT. ONE FA SMELLED ODOR THE FIRST TIME AROUND ROW 15 FOR ABOUT 30 SEC. THE 2ND FA'S SMELLED THE ODOR AT THE AFT OF THE CABIN THE SECOND TIME FOR ABOUT 30 SECONDS. NO ACTION WAS TAKEN BY FLIGHT CREW SINCE THE SECOND OCURENCE WAS NOT REPORTED TO FLIGHT CREW & THE FA WAS NOT TOTALLY SURE ABOUT THE FIRST OCCURENCE.-ACCOMPLISHED T/S IAW TSM 05-50-00-810-831-A NO ODOR SMELL NOTED. AIRCRAFT OK TO RETURN TO SERVICE MOC NOTIFIED .