As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON P/F FOUND NR 4 RIGHT SMOKE DETECTOR WOULD NOT TEST. USED RIDING SPARE SMOKE DETECTOR FOR USE IN NR 4 RT POSITION. REMOVED AND REPLACED SMOKE DETECTOR WITH A SERV DETECTOR IAW B727 MM 26-17-000. CHECKS GOOD. DEFERRED IAW DHL GMM 3.5 CAT II CONTROL 8129E. DOES NOT AFFECT SAFE.