What was found
AFTER T/O, F/A NOTICED ODOR & HAZE VIEWED FROM FWD CREW SEATS IN AFT PORTION OF A/C. VERIFIED SAME CONDITIONS AFT. ADJUSTED AIR CONDITIONING SYS TO INCREASE AIRFLOW AND ELIMINATE ODOR & HAZE. HAZE & ODOR BEGAN TO CLEAR, TEN MINS LATER HAZE & ODORS RETURNED. DIVERT INTO PHL. PERFORMED FUMES REMOVAL CHECKLIST, HAZE/FUMES CLEARING, NO EMERGENCY DECLARED. LANDED WITHOUT INCIDENT, ALL PAX DEPLANED. TROUBLESHOT SYS & COULD NOT DUPLICATE. ENGS RAN 1 HR AT DIFFERENT POWER SETTINGS, COULD NOT DUPLICATE. INSPECTED APU FOR LEAKS & OIL SERVICE WITH NO DEFECTS. INSPECTED ENG FOR EXTERNAL LEAKS & OIL SERVICE WITH NO DEFECTS. INSPECTED AIR CONDITIONING PACK BAYS FOR DEFECTS, NO DEFECTS. A/C RETURNED TO SERVICE.