B737 CABIN CREW HAS EMER MEDICAL KIT WHICH HAD NOT BEEN REPLACED AFTER USE.

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I WAS NOTIFIED THAT I NEEDED TO SEE A SUPVR. I SPOKE WITH MGMNT. SHE INFORMED ME THAT THE FAA WAS INVESTIGATING THE COMPANY CONCERNING AN ACFT THAT HAD FLOWN 95 LEGS WITH THE EMER MEDICAL KIT USED. I WAS INFORMED THAT I WAS ONE OF THE FLT ATTENDANTS INVOLVED AND THAT I HAD FLOWN MULTIPLE LEGS. SHE DID NOT HAVE ANY MORE SPECIFICS ABOUT THE ACFT OR DATES FLOWN BUT THAT I WAS GOING TO RECEIVE A CERTIFIED LETTER WITH THE DETAILS. THE ACFT HAD HAD AN INCIDENT AND HAD FLOWN NEARLY A MONTH WITH THE EMER MEDICAL KIT USED. THE USED KIT WAS DISCOVERED WHEN IT WAS NEEDED ON A FLT. THE KIT IS POSITIONED WITHIN A LOCKED CLR COMPARTMENT. IT IS BEHIND AND ON TOP OF OTHER EMER EQUIP. THE COMPARTMENT IS STUFFED SO TIGHT THAT IT IS IMPOSSIBLE TO SEE THE 2 YELLOW SEALS WITHOUT OPENING THE COMPARTMENT AND TAKING ALL ITEMS OUT. WHEN ANY ITEM IS TAKEN OUT OF THIS LOCKED COMPARTMENT; MAINT USUALLY HAS TO REPACK THE COMPARTMENT. ON ANOTHER TRIP WE PICKED UP A B757 AND DURING THE PREFLT DISCOVERED THE EMER MEDICAL KIT HAD BEEN USED AND NEEDED TO BE REPLACED. NOW THE COMPANY HAS 2 ACFT WITHIN 2 MONTHS WITH THE SAME ISSUE.