As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTM FLIGHT NR 2381: AFT BAGGAGE WARNING INDICATION WHILE TAXING FOR TAKEOFF. RETURNED TO GATE. MAINTENANCE FOUND THE AFT CARGO DOOR HANDLE POPPED OPEN. NO OTHER DEFECTS NOTED. C/W Q400 AMM TASK 52-31-00-710-801. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.