What was found
FLT 4849 - ON CLIMB OUT, LAVATORY SMOKE DETECTOR ACTIVATED WITH LIGHT, BUT INCREASING AMOUNT OF SMOKE EVIDENT IN THE CABIN AND FLIGHT DECK. CREW RETURNED TO DFW AND LANDED SAFELY. MAINTENANCE FOUND SCREWS MISSING FROM THE RIGHT RAM AIR VALVE. INSTALLED NEW ATTACHMENT HARDWARE ON RIGHT RAM AIR DOOR AND ADJUSTED LINEAR ACTUATOR. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (X)