As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SHORTLY AFTER GEAR RETRACTION RECIEVED AFT CARGO DOOR OPEN INDICATION. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PHX WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. REPLACED AFT CARGO DOOR PROXIMITY SWITCH (32MV) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 52-71-12.