As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MLG: LANDING GEAR WOULD NOT RETRACT ON TAKEOFF. FOLLOWED BY POUNDING ON THE UNDERSIDE OF THE AIRCRAFT . GEAR DOWN NORMAL INDICATIONS .///SIGN-OFF///REMOVED AND REPLACED FAILED NLG WOW SWITCH HARNESS ASSY WITH NEW SWITCH HARNESS ASSY WITH RIGGING AND OPERATIONAL CHECK GOO/GEAR SWING GOOD. IAW CE680A MM 32-60-10