As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT FROM PHL TO YTZ, FUSELAGE DOOR WARNING LIGHT ILLUMINATED UPON REACHING FL240. DOORS PAGE SHOWED IT TO BE (AFT) BAGGAGE DOOR. PRESSURIZATION REMAINED NORMAL. AIRCRAFT TURNED AROUND AND RETURNED TO PHL. INTERMITTENT FROM STEADY RED TO GREEN AGAIN.