What was found
DURING DEPT FLIGHT DECK ONLY HAD MILD OIL SMELL. WENT AWAY AT AROUND 5000'. AGAIN DESCENDING THROUGH APPROX 5000' STRONGER OIL SMELL IN FLIGHT DECK ONLY UNTIL ARRIVAL AT GATE. GROUNDED - YES. R & R LT OZONE CONVERTER REF AMM 21-73-01, R & R LT RECIRCULATION FAN IAW AMM21-25-02, R & R LT RECIRCULATION FAN AIR FILTER IAW AMM 21-25-01. R & R LT AIR PRESSURE FILTER ELEMENT PER AMM 29-09-01. NOTE: DURING INITIAL TESTS TO VERIFY ODOR FOUND SOURCE TO BE LT PACK ODOR - RT PACK NO ODOR APU AS BLEED SOURCE. LEAK CHKD GOOD ODOR DISSIPATED AFTER PARTS REPLACEMENT. REF FIM 05-51 TASK 814 & AMM 05-51-56 LEVEL 1.