What was found
DFW - FLT 3853 - CARGO SMOKE DETECTOR MESSAGE IN FLIGHT, BLEW BOTH BOTTLES. REMOVED AND REPLACED FIRE DETECTOR SENSORS AND FIRE BOTTLES, P/N 337000271, S/N 3083601/3239381 AND P/N 3A6000731 S/N 846000731/16185E1. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)