As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT APPROX FL 280, AFT CARGO LIGHT ON FE`S PANEL AND CARGO DOOR LIGHT ON PILOTS PANEL BEGAN FLICKERING, SHORTLY IT CAME ON STEADY. DESCENDED AC TO FL250 AND ACCOMPLISHED FHB PROCEDURES FOR DOOR OPEN LIGHT. AT NO TIME EXPERIENCED PRESSURIZATION PROBLEMS PRIOR TO DEPRESSURIZING AIRCRAFT. FOUND AFT CARGO WARNING SWITCH INOPERATIVE. REMOVED AND REPLACED AFT CARGO WARNING SWITCH IAW MM. OPS CHECK NORMAL. (K)