As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DOOR LIGHT ILLUMINATED, AIRCRAFT DEPRESSURIZED DURING INITIAL CLIMB. RECEIVED LIGHT AT 2000 FT AND CLIMBED TO 4000. RETURNED TO YOW. FOUND AFT CARGO DOOR HANDLE NOT PUSHED IN AND BLOW OUT PLATE NEEDING SECURING. DEFERRED AUTO AND MAUAL PRESSURIZATION. PERFORMED PRESSURIZATION OPERATIONAL CHECKS - OPS CHECKED GOOD.