As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXTREMELY LOUD NOISE (SCREECHING) COMING FROM MAIN CABIN DOOR ON CLIMB OUT. FA CALLED US AT 060. NOISE SUBSIDED AS WE LEVELED OFF AT LL 120. PERFORMED CABIN PRESSURIZATION UP TO 4.0 PSI IAW AMM 21-31-00. PERFORMED LUBRICATION OF PAX DOOR SEALS IAW MAINTENANCE PRACTICES. FOUND NO LOUD NOISE OR SCREECHING NOISE COMING FROM MAIN PAX DOOR. OPS CHECK GOOD. NO FURTHER DEFECTS NOTED.