As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF, GEAR WOULD NOT RETRACT WITH EITHER POSITION. DETECTION SYS HAD RED UNLOCK AND GREEN DOWN AND LOCKED INDICATIONS SIMULTANEOUSLY OTHER INDICATION SAME LAST FLIGHT. BITE CHECKED PROXIMITY BOX, NO FAULTS NOTED. REPLACED MLG BOGIE BEAM PITCH DAMPER IAW AMM 32-11-15-04-01.