What was found
AIRCRAFT WAS GROUNDED: RETURNED TO LAS, AFTER T/O FAS HEARD LOUD POP AND VIBRATION AND WHISTLE FROM R-1 DOOR. DESCRIPTION FROM FAS MADE IT SOUND LIKE SLIDE MAY HAVE BLOWN. FOUND EXT HANDLES OUT AFTER LANDING.UPON ARRIVAL FOUND L-1 EXIT DOOR HANDLE ASKEW RESEQUENCED L-1 DOOR HANDLE. INSPECTED L-1 DOOR HANDLE TENSION IAW AMM 52-11-00 AND INSPECTED L-1 SLIDE PACK IAW AMM 25-66-01. NO DEFECTS FOUND. PRESSURIZED A/C TO 4PSI IAW AMM 05-51-91.