As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON TAKE-OFF AT APPROXIMATELY 30 KNOTS THE MASTER CAUTION AND AFT ENTRY DOOR ILLUMINATED. A REJECT WAS ACCOMPLISHED WITH MAX SPEED OF 45 KNOTS. PERFORMED FIM 52-10-00, AFT ENTRY DOOR LIGHT OPERATIONS CHECK NORMAL.