What was found
(CAN) AFTER DEPARTURE, L1 DOOR INDICATION SHOWED OPEN, CREW DESCENDED TO 10,000 FEET. CONSULTED WITH MOC WHO CHECKED WITH ACFT & ALSO SHOWED L1 OPEN. FLIGHT CONTINUED, NO LOSS OF PRESSURIZATION OCCURRED. RESOLUTION L1 DOOR, CLOSE & LATCH PROX SENSOR & TARGET BRACKET ASSEMBLY CHECKED FOR INTEGRITY. NO DAMAGE & OR FAULTS NOTED. PROX SENSOR ASSEMBLY CLEANED & DOOR OPERATION FUNCTION CHECKED. NO RECURRENCE OF FAULT NOTED.