What was found
(CAN) THE LT ENGINE FIRE DETECTOR ILLUMINATED ON APPROACH. PILOT DECLARED AN EMERGENCY AND CONTINUED APPROACH TO LANDING. WARNING ANNUNCIATOR EXTINGUSHED ABOUT 1 MIN LATER (CO-INCIDENTAL WITH CLEARING IMC CONDITIONS). THE PILOT CONTINUED TO LANDING. A SUBSEQUENT GROUND CHECK SHOWED NO SIGNS OF FIRE OR OVERHEATING. WHEN CHECKED WITH THE ACFT MFG, THEY APPEARED TO BE AWARE OF SIMILAR FALSE INDICATIONS POSSIBLY AS A RESULT OF MOISTURE.