As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, FAULT CODE 52-34-XB-00, MAIN CARGO DOOR LIGHT ILLUMINATED. THE CREW RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX PERFORMED CARGO DOOR OPS CHECK IAW IAI 52-32-00. PRESSURIZED ACFT TO 4.5 IAW MM 05-51-22. INDICATIONS WERE NORMAL. INSPECTED ALL DOOR LATCHES FOR SIGNS OF DAMAGE. NONE NOTED. ACFT WAS RETURNED TO SERVICE.