As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB EXPERIENCED MOMENTARY CHECK FIRE DET WARNING MESSAGE. COMPLIED WITH CHECK LIST. INTERROGATED CDS FOR FAULTS NO FAULTS LOG. INSPECTED APU FIRE DET SYS, RESEATED PNEUMATIC DETECTOR CONNECTOR. VISUAL INSP SHOWED NO DEFECTS. C/W AMM TASK 26-13-00-710-810. OPS TEST OF APU FIRE DET OPS CHECK GOOD. NO FURTHER DEFECTS NOTED. RETURNED TO SERVICE. NO PARTS REPLACED.