As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR OPEN LIGHT ILLUMINATED UPON REACHING CRUISE FLIGHT. EMERGENCY PROCEDURE PERFORMED AND LIGHT EXTINGUISHED WHILE SLOWING AIRSPEED TO 80 KNOTS. VERIFIED THE DOOR WAS LATCHED CORRECTLY AND THE PINS WERE IN. AFTER SPEEDING BACK UP TO CRUISE SPEED THE LIGHT CAME BACK ON, THEN OFF MULTIPLE TIMES. DECIDED TO FOLLOW THE EP AND LAND AS SOON AS PRACTICAL.