What was found
RED "DOOR PAX OPEN" CAS MSG CAME ON 41 MINUTES INTO THE FLIGHT. CRUISE ALTITUDE WAS 41,000 FEET AND OUTSIDE AIR TEMP -26C. ALL PRESSURIZATION INDICATIONS WERE NORMAL, DOOR LATCHES CHECKED GOOD ON PRE/POST FLIGHT. CORRECTIVE ACTION: REMOVED SUSPECTED DAMAGE PAX DOOR HARNESS P/N 505-24447-401 5/N F038683319 AND INSTALLED NEW CUSTOMER SUPPLIED PAX DOOR HARNESS P/N 507-26093-401 S/N F043927034. PERFORMED OP CHECKS WITH NO DEFECTS NOTED. INSTALLED PAX DOOR AIRSTAIRS AND CLOSED ALL GAINED ACCESS. REF EMB505 AMM 52-14-00, WSM 52-70-50