What was found
THE CARGO FIRE LIGHT ILLUMINATED WHILE EN ROUTE FROM IAH TO YYZ. NO BELL SOUNDED. THE CARGO FIRE SYSTEM TESTED NORMALLY, BUT THE LIGHT REMAINED ON AFTER TEST. RESET ALL CIRCUIT BREAKERS FOR CARGO FIRE SYSTEM, BUT THE FIRE LIGHT WOULD NOT GO OUT. THE AIRCARFT WAS DIVERTED TO SDF WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NO EVIDENCE OF FIRE. THE COCKPIT FIRE SUPRESSION SYSTEM PANEL WAS REMOVED AND REPLACED AND OPERATION CHECKED GOOD IAW MM 26-16-10, PAGE 209.