What was found
FLIGHT 51395 SMOKE MASTER WARNING ANNUNCIATOR ILLUMINATED INTERMITTENTLY IN FLIGHT FOR APPROX 5 SECOND INTERVALS EACH TIME, THEN EXTINGUISHED. CREW RETURNED TO BASE AS A PRECAUTIONARY MEASURE. UPON INSP, MX FOUND A PIN PUSHED OUT OF THE BAGGAGE SMOKE DETECTOR CONNECTOR. THE SMOKE DETECTOR WIRING WAS CHECKED FOR DEFECTS AND PIN AND CONNECTOR WERE RESEATED. OPS CHECK WAS GOOD AND NO FALSE WARNING INDICATION, REOCCURANCE WAS REPORTED.