As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT FLYING DURING CRUISE, RIGHT ENGINE GAVE A MOMENTARY FIRE WARNING LIGHT. NO SECONDARY INDICATIONS NOTICED. AIRCRAFT DESCENDED TO DESTINATION AIRPORT KYIP WITH NO FURTHER ISSUES. AFTER INVESTIGATION, MAINTENANCE FOUND THE TAIL PIPE FIRE DETECT LOOP ELEMENT CRACKED AT THE BASE. REPLACED AFT TAIL PIPE FIRE LOOP WITH SERVICEABLE TESTED FIRE LOOP ELEMENT. NO DEFECTS NOTED. ALL WORK PERFORMED IN ACCORDANCE WITH THE LEARJET MM-99 CHAPTER 26-10-01.