What was found
DURING DESCENT AROUND 10000 FT A SMELL WAS DETECTED THROUGHT THE A/C - FA'S DESCRIBER IT AS MELTED CRAYON-MORE PREVELANT IN THE REAR. TURNED PACK 1 OFF IN THE TIME WE HAD AND THE SMELLED DISSIPATED. DESCRIPTION OF ODOR/FUMES: PRESISTENT, UNFAMILIAR CHEMICAL SMELL. APPARENT CABIN SOURCE: UNKNOWN. FLIGHT DECK, FWD CABIN/GALLEY (LAV), MID CABIN, AFT CABIN/GALLEY(LAV). NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-PERFORMED INSPECTION OF FUMES EVENT IAW TSM 05-50-00-810-831-A. FOUND ENG 1 TO BE CAUSE OF ODOR IN CATEGORY B. SEE LB 3541987-2 AND 3541988-1 FOR FURTHER ACTION. MOC # 119255.