What was found
LOUD RUMBLING NOISE FROM NOSE AFTER TAKEOFF AND CONTINUED AT FLIGHT LEVEL. FOUND DOOR OPEN ON ARRIVAL, DEBRIEFED CREW ON ARRIVAL, FLIGHT CREW STATED THAT THE RUMBLING NOISE WAS COMING FROM THE RT SIDE OF THE FLIGHT DECK ABOUT WHERE THE EXTERNAL POWER DOOR LOCATED. FOUND EXTERNAL POWER DOOR OPEN ON ARRIVAL. REF EC/RA 5240-01817, ACCOMPLISHED PART 1 INTERIM REPAIR, DOOR IS HARD TO OPERATE BUT DOOR LATCHES OPERATE NORMAL, NO OTHER DAMAGE FOUND AROUND FUSELAGE, SECURED DOOR CLOSED & APPLIED SPEED TAPE.