As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LANDING GEAR WOULD NOT RETRACT. WITH LDG GEAR HANDLE UP STILL HAD (3) GREEN INDICATION. CYCLED GEAR HANDLE DOWN AND BACK UP WITH SAME INDICATION. SELECTED LANDING GEAR HANDLE DOWN AND PERFORMED (MANUAL GEAR EXTENSION) IAW CHECKLIST. REMOVED AND REPLACED LANDING GEAR CONTROL UNIT IAW MM 32-30-01. OPS CHECK GOOD.