As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN DOOR LIGHT ILLUMINATED INTERMITTENTLY AFTER DEPARTING ESC. AIRCRAFT RETURNED WITHOUT DECLARING AN EMERGENCY, LIGHT WENT OUT ON GROUND. THE SIGHT WINDOW WAS CHECKED, NO SQUEALING HEARD AND LATCHES WERE LOCKED. MAINTENANCE ADJUSTED MAIN DOOR WARNING MICROSWITCH IAW SF3 AMM CH 52-70-00-5. OPS CHECK GOOD.