What was found
DOOR PAX FWD OPEN EICAS MESSAGE INFLIGHT AT FL310. FA INFORMED US DOOR WAS SHOWING ONE WHITE, ONE GREEN FOR THE DOOR LATCH INDICATORS. EICAS MESSAGE TURNED OFF AT ONE POINT, THEN CAME BACK ON. EICAS MESSAGE DISAPPEARED ON DESCENT. DECLARED EMERGENCY, LANDED WITHOUT INCIDENT. R&R ROLLER DETECTOR SHAFT AND ADJUSTED THE LATCH SENSOR TARGET TRAVEL.