As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE L1 DOOR WAS VERY DIFFICULT TO CLOSE AND THE DOOR SQUEALS VERY LOUDLY WHEN PRESSURIZED. MAINTENANCE TROUBLESHOT AND FOUND THE L1 DOOR FRAME TRIM PANEL CLIP NUT NOT ENGAGED CORRECTLY CAUSING A RAISED AREA FOR SEAL TO SEAT. RESEATED CLIP NUT AND PRESSURIZED AIRCRAFT TO 4 PSI. NO LOUD SQUEALS NOTED. OPS CHECK OF L1 DOOR CHECKS OK - REF: AMM 52-11-00-501.