As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED MAIN CABIN DOOR DEVELOPED A LEAK IN UPPER RT CORNER WHILE CLIMBING THROUGH FL270. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND SEAL DISLODGED FROM CHANNEL. MAINTENANCE REINSTALLED, CLEANED AND LUBED SEAL AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.