As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERSION -- AFTER T/O LANDING GEAR SELECTED UP, CONSTANT GEAR WARN HORN. WHEN GEAR FELT FULLY RETRACTED STILL HAD 3 RED GEAR LIGHTS WITH CONSTANT HORN. RESELECTED GEAR DOWN 3 GREENS DOWN LOCKED. RETRACTED GEAR, NO HORN 3 REDS WITH GEAR UP. REMOVED AND REPLACED S-78 LANDING GEAR LEVER SWITCH AND NR 2 AUTO THROTTLE PACK ASSY SWITCH PER MM.