As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR EXTENSION, NOSE GEAR HUNG UP FOR ABOUT 30 SECONDS AND EXTENDED NORMALLY, BUT WITH A LOUD THUMPING NOISE. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE VISUALLY CHECKED NOSE LANDING GEAR FOR CRACKS, NONE FOUND. NOSE GEAR WAS GREASED AND AN OPERATIONAL CHECK AND INSPECTION WAS PERFORMED.