What was found
MAIN CARGO SMOKE ALARM CAME ON 10 MIN INTO FLIGHT. NR 2 AREA ILLUMINATED FLIGHT LEVEL 210 EMERGENCY PROCEDURES ACCOMPLISHED AS PER CHECK LIST. NR 2 EXTINGUISHED 2 MINUTES LATER. RE-ILLUMINATED 10 MINUTES LATER. ON 5 MILE FINAL, CYCLED ON AND OFF 3 TO 4 TIMES. EVACUATED AIRCRAFT VIA EMERGENCY SLIDE. *S/D* SWAPPED CANNON PLUGS ON DETECTORS, PROBLEM FOLLOWED, FLASHING LIGHT POSITION NR 2. REMOVED AND REPLACED NR 2 SMOKE DETECTOR PER MAINTENANCE MANUAL 26-16-1, OPERATIONAL CKS GOOD.