As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 1L DOOR HARD TO OPEN AND F/A SAID LOUD WHISTLING SOUND ENROUTE. MAINTENANCE ACCOMPLISHED AMM TASK 52-11-14, DOOR DAMPER AND EMERGENCY DAMPER OPERATION, ADJUSTMENT AND TEST OF THE L1 DOOR. DOOR OPENING CHECKED OK. CLEANED PRESSURE SEAL ON L1 DOOR AND ACCOMPLISHED A SATISFACTORY LEAK CHECK IAW AMM 21-31-00-710-002-A.