What was found
(CAN) FLT 210 FLYING AT 240 KTS IAS, VMC APPROXIMATELY 10 MINS AFTER TAKEOFF. WE GOT A SMOKE WARNING, ON CAUTION / WARNING PANEL, MASTER WARNING FLASHING, TRIPLE CHIME & FWD FIRE BOTTLE ARM ;T ON, FWD BAGGAGE EXT SWITCH LT/PUSH BUTTON ON. ALL INTERMITENTLY ON SEVERAL TIMES FOR 4/5 MINS PERIOD. REQUESTED RETURN - STARTED DESCENT INFORMED CA, INFORMED PAX, ORH - CHECKLIST FOLLOWED, DUE TO INTERMITENT WARNING - NOT ABLE TO BOTTLE, SEVERAL MORE WARNINGS DURING APPROACH SVG. NORMAL LANDING, PASSENGERS DISEMBARKED AT STAND 40, THROUGH L1-PAX DOOR. NEVER ANY SMELL OF SMOKE OR VISUAL SIGN OF SMOKE/FIRE.