What was found
12/26/2014 AT APPROX 09:45, ON TAKEOFF, THE FIRE WARNING LIGHT ILLUMINATED. ACFT WAS IMMEDIATELY RETURNED & LANDED WITHOUT EVENT. MX FOUND A BAD FLAME DETECTOR, PN 92310-04802-105, SN REMOVED 5853, INSTALLED SN 4565. THERE WAS NO INDICATION THAT A FIRE HAD OCCURRED, ACFT RETURNED TO SERVICE.