What was found
CREW REPORTS OIL SMELL IN FWD CABIN AND FLT DECK AREA IN FLT. ODOR SEEMED TO DISSIPATE WITH LEFT PACK SELECTED OFF. NO SMOKE REPORTED. MAINT TEXT: PER SMOKE ODOR QUESTIONARE-PILOT REPORTS SWEET BURN SMELL MORE LIKE DE-ICING FLUID, OR HYD FLUID THAN FUEL. SOME IMPROVEMENT WITH LEFT PACK OFF. SMELL RETURNED STRONGER DURING DESCENT WITH SAME LEFT PACK OFF CONFIG REF AMM 21-00-00-0200A AND 21-00-21. VISUALLY INSPECTED APU, BOTH ENGINES AND ASSOCIATED DUCTING. RAN APU AND BOTH ENGINES WITH BOTH PACKS ON FULL WARM. SMELL DISSIPATED AFTER ABOUT 45 MINUTES. OK FOR SERVICE.