As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR WARNING HORN SOUNDED ABOUT 20 SECONDS AFTER GEAR RETRACTED. ALL ADVISORY LIGHTS SHOW NORMAL, HORN STOPS AFTER SOUNDING THE SECOND TIME. PERFORMED LANDING GEAR HORN OPS CHECK IAW 32-30-01. R & R LANDING GEAR CONTROL PANEL AND RELAY 3151-K1. OPS CHECKED GOOD.