What was found
AVIONICS SMOKE LIGHT CAME ON DURING APPROACH TO KABE. DECLARED AN EMERGENCY. LANDED WITH NO VISIBLE SMOKE APPARENT. INSPECTED AVIONICS BAY AND NO SMOKE OR FUMES NOTED. DID NOTE HIGH HUMIDITY LEVELS IN THE LOWER CARGO/AVIONICS BAY AREAS. DEPARTURE STATION, IND, HAD PRECIPITATION REPORTED EARLIER, BUT NO NOTED RAIN INGRESSION NOTED IN AVIONICS BAY ON ARRIVAL IN ABE. REMOVED PLUG CONNECTOR FROM 13WA SMOKE DETECTOR AND AVIONICS SMOKE ALERT WAS REMOVED, CONNECTED PLUG BACK AND FAULT REAPPEARED. FAULT OF AVOINICS SMOKE WAS INDICATION ONLY DUE TO SUSPECT HIGH HUMIDITY ON A/C. REMOVED AND REPLACED SMOKE DETECTORS 11WA, 12WA AND 13WA, REF A300 AMM 26-15-12-04. ALL OPERATIONS TEST PASS. NO AVIONICS SMOKE WARNINGS PRESENT, ITEM CLOSED.