As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BFF/DEN - FLT 7678 - ON APPROACH INTO DEN, THE CREW EXTENDED THE GEAR AND THE DOWNLOCK ANNUNCIATOR DID NOT ILLUMINATE. THE CREW WENT AROUND THE PATTERN AND ATTEMPTED TO MANUALLY EXTEND THE GEAR, BUT FOUND THE GEAR WAS EXTENDED. AN EMERGENCY WAS DECLARED AND THE CREW LANDED IN DEN WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED THE DOWNLOCK ANNUNCATOR ASSY, OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)