What was found
SUPPLEMENTAL FA REPORTS EXHAUST SMELL CONCENTRATED TOWARDS FORWARD CABIN DURING DESCENT. NO SMELL IN COCKPIT. TURNING OFF RECIRC FANS SEEMED TO LESSEN THE SMELL. BOTH PACKS BOTH BLEEDS SELECTED OCCURED COMING THROUGH FL180 ALL THE WAY TO LANDING. ODOR PERSISTED SLIGHTLY EVEN AFTER DOORS OPENED AND PAX DEPLANED. OFFLINE PILOT DESCRIBED AS APACK OVERHEAT TYPE OF SMELL. NO EVIDENCE OF STAINS ON PACK INLET. C/A-DETERMINED RT PACK HAS BEEN CONTAMINATED WITH COFFEE IAW FIM 21-20-00. DEFERED RT PACK. ACCOMPLISHED RT PACK DUAL HEAT EXCHANGER CLEANING IAW EO NUMBER EJ-2100-006. OPS CHECK GOOD. MEL ITEM RESTORED. REINSTALLED RH PACK OUTLET DUCT BELLOWS IAW AMM TASK 21-51-05.