What was found
ON ARRIVAL INTO SJO DESCENDING FROM 15000 FT, ACFT ENTERED A CLOUD AND THE CABIN FILLED WITH A STRONG SMELL OF SULFUR. EXITED THE CLOUD IN LESS THAN 30 SECS AND THE ODOR CLEARED CLOUD ASSOCIATED. PERFORMED INSP OF ENGINES INLET AND EXHAUST, FAN BLADES, WINGS L/E, NOSE RADOME, FUSELAGE AND WINDSHIELDS IAW PARAGRAPH C OF AMM 05-51-31-2, TAT SENSORS AMM 34-12-02, AOA VANES AMM 34-02-3, RAM AIR DUCT INLET AND EXHAUST DOORS AMM 21-53-01/21-53-02, PRIMARY AND SECONDARY.