What was found
RIGHT ENGINE FIRE WARNING TEE HANDLE LIGHT CAME ON IN FLIGHT. REMOVED RT FIRE DETECTION CONTROL UNIT P/N 37702833 S/N 0143-069 AND INSTALLED REMOVED SERVICEABLE FIRE DETECTION CONTROL UNIT P/N 377-02833, S/N 9938-006 IAWL31A 26-10-01. OPERATIONAL CHECK GOOD AT AT THIS TIME. REMOVED RIGHT ENGINE T/R ASSY., UPPER &LOWER INNER FAN DUCT PANELS. INSTALLED INSPECTED/ TESTED HOT SECTION SENSING ELEMENT PN 244-07235 REMOVED FROM ENGINE SN P-99515 IAW LEARJET 31 SERIES M.M. 26-10-02. INSTALLED UPPER & LOWER INNER FAN DUCT PANELS AND T/R ASSY. IAW TR4000 M.M. 78-31-00. PERFORMED ENGINE RUN AND T/R TEST. OPS &LEAK CHECK OK.