What was found
AIRCRAFT WAS GROUNDED: FIRST FLIGHT ATTENDANT REPORTED A LOUD BANG COMING FROM DOOR 1L WHILE DESCENDING INTO CHARLOTTE. MAINTENANCE FOUND THE L1 SLIDE OFF THE ALIGNMENT HOOKS, SLIDE COVER RUBBING FUSELAGE WHEN DOOR OPEN/CLOSED. MAINTENANCE REMOVED L1 DOOR SLIDE + LINERS, PRESSURIZED AIRCRAFT AND NOTED NO NOISE. MAINTENANCE RE-INSTALLED LINERS AND SLIDE, ALONG WITH A NEW SLIDE COVER AND PRESSURIZED THE AIRCRAFT AGAIN WITH NO NOISE NOTED.