What was found
L1 DOOR INDICATED OPEN DURING DESCENT THROUGH 18,000, PRESSURIZATION WAS NORMAL AND THE DOOR INDICATED CLOSED AGAIN AFTER ABOUT 1 MINUTE. CLEANED L1 DOOR VENT FLAP CONNECTOR IAW EMB 170 AMM 20-61-20. PERFORMED PASSENGER DOOR LOCK ADJ/TEST IAW EMB 170 MM 52-12-52, OPS CHECK GOOD.