What was found
CREW VERBAL ON AIRCRAFT DESCENT AT 7K, ODOR IN THE FORWARD CABIN FLT DESK. CREW SAID IT SMELLS LIKE HOT OIL SMELL OR OZONE CONVERTER. SUPPLEMENTAL DATA UPDATE THE PROBLEM WAS DUE TO FAULTY RH HYDRAULIC PNEUMATIC PRESSURIZATION MODULE. THE PNEUMATIC DUCTING WAS CONTAMINATED BECAUSE THIS UNIT WAS ALLOWING A SMALL AMOUNT OF HYDRAULIC FLUID PASS THROUGH THE CHECK VALVE. THE MODULE WAS REPLACED, AND A VERY THOROUGH PNEUMATIC DUCTING AND PACK BURNOUT WAS ACCOMPLISHED. AIRCRAFT WAS RETURNED TO SERVICE WITHOUT FURTHER ODOR COMPLAINTS.THE ABOVE IS ALSO THE RESPONSE TO MRR NUMBER 2001UALA00163.