As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT OF KCOF WHILE PERFORMING THE GEAR UPLATCH CHECK THE DOOR NOT LATCH LIGHT ILLUMINATED. THE CREW FOLLOWED PROCEDURES AND RETURNED TO KCOF AND LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT THE SYSTEM AND ADJUSTED THE MAIN GEAR FOLLOW UP MECHANISM. THE GEAR WAS SWUNG AND THE OPERATIONAL CHECK WAS SATISFACTORY. THE AIRCRAFT WAS RETURNED TO SERVICE IAW DC8 MM 32-31-5.