As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5573-STL-BLEED NR 2 LEAK-FLIGHT ATTENDANT SAID SHE HEARD A LOUD RUMBLING NOISE AND A RUSH OF AIR UNDER THE FLOOR. MAINTENANCE INSPECTED AND FOUND BLEED COUPLER AT RT FORWARD OVERWING TO BE LOOSE. REMOVED AND REPLACED O-RINGS AND INSTALLED COUPLER.