As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 18K FEET AIRCRAFT 343EN LOST CABIN PRESSURE WITH A SQUEAL FROM THE REAR SERVICE DOOR. PGV INSPECTED CABIN DOORS. CLEANED AND RESEATED DOOR SEAL AND PLACED PRESSURIZATION ON MEL. ROA MAINT REMOVED AND REPLACED REAR SERVICE DOOR SEAL ASSY IAW AMM 52-36-00. PRESSURIZED AIRCRAFT TO 5.5 DIFF WITH NO LEAKS, CLEAR MEL.