As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT DIVERTED TO SJU ON ACCOUNT OF LOUD SQUEEL COMING FROM L1 DOOR (AIR PUSHING NOISE). EMERGENCY WAS DECLARED. MAINTENANCE CHECKED 1L DOOR & FOUND DEBRIS IN LOWER AREA, CLEANED DEBRIS & INSPECTED SEAL INTEGRITY, FOUND OK. ACCOMPLISHED CABIN PRESSURE LEAK TEST IAW AMM 05-51-91-790-801. FOUND OK.