What was found
DURING CLIMBOUT, FLIGHT ATTENDANTS NOTED A BURNING ODOR AND HAZE IN THE CABIN AROUND EMERGENCY EXIT ROW 16. IN THE COCKPIT, SMELLED LIKE A CANDLE WICK. RAN SMOKE, FIRE OR FUMES CHECKLIST. COULD NOT FIND AN IDENTIFIABLE SOURCE. RETURNED TO DEPARTURE. THE AIRCRAFT WAS GROUNDED. ACCOMPLISHED MCM 05-96-70. ACCOMPLISHED FIM 71-05-00-810-807. REPLACED THE RECIRCULATION AIR FILTERS IAW AMM 21-25-01. REMOVED EXCESS LUBRICANT FROM RIGHT ENGINE FAN BLADES. ACCOMPLISHED HIGH POWER ENGINE RUNS, AND APU ALTERNATELY FOR PACKS. NO ODOR NOTED. OK FOR SERVICE.