What was found
LAS - FLT NR 624 - CREW REPORTED AN ELECTRICAL OR HOT PLASTIC ODOR IN THE CABIN DURING DESCENT AND LANDING. INSPECTION OF ALL LAVATORY WASTE CONTAINERS, OVENS, BUN WARMERS AND COFFEE MAKERS REVEALED NO PLASTIC RESIDUE OR OVERHEAT CONDITION, ODOR HAS DISSIPATED. HOWEVER, DURING BOARDING OF OUTBOUND FLIGHT 651, THE ODOR RETURNED WITH THE AIR CONDITIONING PACKS OPERATING. FOUND THE LEFT THRUST REVERSER RETURN LINE LEAKING SKYDROL. TIGHTENED THE 'B' NUT AND SYSTEM LEAK CHECKED GOOD. CLEANED TAIL COMPARTMENT AREA, PERFORMED HIGH PRESSURE BURNOUT OF HIGH PRESSURE DUCTING AND REPLACED BOTH COALESCERS. SYSTEM OPERATED NORMALLY WITH NO ODORS DETECTED. REFERENCE ASAA9680080.