As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 16,000 FT, NR 4 MAIN CARGO SMOKE LIGHT ILLUMINATED. RAN QRH PROCEDURES. LIGHT EXTINGUISHED. SHORTLY AFTER LEVELING AT FL 230, NR 4 SMOKE WARNING REOCCURRED. TEST OF SYSTEM SHOWED BAD NR 4 SENSOR, IE TEST NOT GOOD. REMOVED AND REPLACED NR 4 DETECTOR AS PER 727 200-26-16-011-4, OPS CKS GOOD MEL REMOVED. R/I FROM FACT PREMATURE REMOVAL/INSTALLATION OFF MFG 7740-01.