As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB THE FORWARD CARGO DOOR ANNUNICATOR LIGHT ILLUMINATED AND CAPTAIN OBSERVED CABIN WAS UNPRESSURIZED. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT WAS GROUNDED. ADJUSTED FORWARD CARGO DOOR SENSOR TARGET AND PERFORMED BITE CHECK AT PROXIMITY BOX WITH NO FAULTS FOUND IAW AMM 52-70-02.