As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JAX --- CREW REPORTED, "LANDING GEAR LEVER DISAGREE" EICAS MESSAGE AFTER TAKE OFF THEN TRIED TO RETRACT THE LANDING GEAR. LANDING GEAR WOULD NOT RETRACT. QRH PROCEDURES PERFORMED. LANDED UNDER-WEIGHT. LANDING WAS UNEVENTFUL. MAINTENANCE PERFORMED A GENERAL VISUAL INSPECTION, INSTALLED LANDING GEAR PINS, AND MAINTENANCE FERRIED THE AIRCRAFT TO IAH FOR REPAIR. IAH MAINTENANCE TROUBLESHOT AIRCRAFT AND REMOVED AND REPLACED THE LANDING GEAR CONTROL LEVER IN REFERENCE TO EMB145 AMM 32-32-02-4, SYSTEM OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.