As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE CLIMBING THROUGH FL180, CREW REPORTED LOUD SQUEAL BEGAN AROUND PASSENGER DOOR. CREW DIVERTED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND CUT IN DOOR SEAL BELOW SUPPORT WHEEL ARM. MAINTENANCE REMOVED AND REPLACED PASSENGER DOOR SEAL AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT RELEASED FOR SERVICE.