As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY ONE HOUR AND THIRTY MINUTES AFTER TAKEOFF AT FL 360, LEAD F/A REPORTS HIGH PITCH SQUEALING SOUND FROM ACFT LT OVERWING EXIT DOOR, ALL OTHER INDICATIONS NORMAL. REMOVED EXIT DOOR AND PERFORMED VISUAL INSPECTIONS IAW AMM AND FOUND UPPER FWD CORNER DOOR SEAL LOOSE. SECURED AND CLEANED DOOR SEALS IAW AMM. LEAK CHK GOOD AND INSTALLED DOOR IAW AMM.