As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DOOR FLAPPING NOISE HEARD AFTER GEAR EXTENSION, TOOK LANDING GEAR CYCLE LONGER THAN NORMAL TO EXTEND. GEAR INDICATOR SHOWED 3 GREEN SIMULTANEOUSLY. EMERGENCY LANDING DECLARED WITH UNEVENTFUL LANDING. (K) R&R NOSE LANDING GEAR SELECT VALVE PER AMM 32-33-10. (A)