As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE THE SERVICE DOOR SEAL WAS FOUND TO HAVE GAPS WHERE LIGHT WAS VISIBLE AND WAS MAKING A LOUD SQUEALING SOUND. THE AIRCREW DIVERTED AND LANDED SAFELY WITHOUT INCIDENT. NO EMERGENCY WAS DECLARED. UPON INSPECTION, MAINTENANCE FOUND THE SEAL TO BE INSTALLED INCORRECTLY. THEY REMOVED AND REINSTALLED THE SERVICE DOOR SEAL IAW AMM 52-43-04. PRESSURIZATION CHECK WAS GOOD. THE ACFT WAS APPROVED FOR RETURN TO SERVICE.