As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DOOR WARNING ACTIVATED. RETURNED TO FIELD. LANDING UNEVENTFUL. COMPLIED WITH OPS TEST OF THE UPPER FORWARD EMERGENCY EXIT DOOR IAW AMM 52-22-00-710-803. FOUND NO PRESENT FAULTS ON THE PSEU. NO OTHER DEFECTS NOTED. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.