What was found
SHIP 9569 -ATB- CABIN CREW STATED THAT THERE WAS A SLOW DEPRESSURIZATION OCCURRING DURING THE CLIMB OUT AFTER TAKEOFF. THE LEAD F/A PASSED OUT (REGAINED CONSCIOUSNESS LATER) AND ANOTHER FELT LIGHTHEADED. THE OXYGEN MASKS AT ROW 24DEF DID AUTOMATICALLY DEPLOY BUT WERE NOT ACTIVATED BY PASSENGERS. NEITHER F/A WERE ABLE TO CONTINUE THEIR DUTIES SO THE AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: MAINTENANCE FOUND A CUT IN THE DOOR SEAL LOWER CORNER ON THE 1L DOOR. THE DAMAGED SEAL WAS REPAIRED PER B717 SRM 52-10-17-2R PROC 1. (LP #0317194)