As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT FL 240 "CHECK FIRE DET" MASTER WARNING ILLUMINATED. 'APU BOTTLE LOW FAULT' LIGHT ILLUMINATED STAYED ON FOR ABOUT 05 SECONDS THEN WENT OUT. REPLACED CONNECTOR 2600 P12 INSTALLING NEW SOLDER SLEEVE TO SHIELD IAW WDM 26-23-00 AND WM 20-15-00. OPS TEST OF THE APU FIRE DETECTION SYS CHECKS GOOD IAW AMM 26-13-00-710-801. RETURNED TO SERVICE.