As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT FROM ANC THRU 5,500 FEET, THE CABIN DOOR LIGHT ILLUMINATED. A/C RETURNED TO ANC AND DESCENDING THRU 5,000 FEET THE LIGHT EXTINGUISHED. MAINTENANCE ADJUSTED DOOR SWITCHES IAW 52-70-00. NOTE MECHANIC HAD WORKED ON THE DOOR SYSTEM THE PREVIOUS NIGHT.