What was found
AIRCRAFT 5010, ON DESCENT THROUGH 14,000 FT BEGAN SMELLING AN ODOR, CONFIRMED WITH JUMPSEATERS SMELL. ALL 4 DONNED O2 MASKS. ODOR PERSISTED THROUGH DESCENT. 1 JUMPSEATER HIT DELUTER ON MASK SHORT FINAL TO SEE IF FUMES DISSIPATED. STATED FUMES WERE STRONGER. TALKING WITH F/A'S WHOLE DESCENT THEY STATED THEY DIDN'T SMELL ANYTHING ABNORMAL IN AFT OF A/C. AT GATE ENG SHUTDOWN BLEEDS OFF FUMES DISSIPATED. CORRECTIVE ACTION: REPLACED NO.1 ENGINE PER AMDS WC 7100-9905LH. (LP 7356916)