What was found
DURING CRUISE FLIGHT ATTENDANT AND SEVERAL PASSENGERS DETECTED ODOR NEAR ROW 14AC. AN ON BREAK PILOT DETECTED NO ODOR. DURING LATER PORTION OF FLIGHT TWO OTHER PILOTS DETECTED NO ODOR. DURING DESCENT, FLIGHT ATTENDANT ADVISED 3 OTHER FLIGHT ATTENDANTS EXPERIENCING HEADACHES AND NAUSEA. 1 FLIGHT ATTENDANT UTILIZED OXYGEN & WAS MET BY PARAMEDICS FOR EVALUATION. WE WERE INFORMED THESE SYMPTOMS WERE EXPERIENCED BY THE 3 FLIGHT ATTENDANTS WORKING LEFT SIDE OF A/C. THEY INDICATED NO ODOR PRESENT AT THAT TIME. MAINTANCE RAN AIRCRAFT WITH PACKS AND ALL ELECTRICAL POWER FOR APPROXIMATELY 12 HOURS, NO SMELL OR ODORS NOTED AT THIS TIME.