What was found
ON PREFLIGHT IN SJU, CREW NOTED A SLIGHT SMOKE SMELL IN THE LT WHEEL WELL. ON TAKEOFF, THE SMELL WAS NOTED AGAIN, BUT DISSIPATED. THE SMELL RETURNED AND THE FLIGHT DIVERTED TO GSO. MAINTENANCE OPERATED THE PACKS FROM VARIOUS SOURCES THROUGH FULL TEMPERATURE RANGE WITH NO ABNORMALITIES NOTED. INSPECTED ALL PASSENGER SEAT ELECTRONIC UNITS, ENTERTAINMENT FEED-THROUGHS, EQUIPMENT RACKS, ELECTRICAL POWER CENTERS AND CARD FILES. NO ABNORMALITIES WERE NOTED. FOUND THE RT RECIRCULATION FAN EMITTING A FAINT ODOR. REPLACED FAN.