As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW TRIED TO RETRACT THE GEAR AND NOTHING HAPPENED. NO SINK RATE WAS BELOW 200 FT/MIN. INSPECTED LANDING GEAR AND FOUND NLG DOWN LOCK PROX SWITCHES OUT OF ADJUSTMENT. ADJUSTED NLG DOWN LOCK SWITCHES IAW EMB MM 32-63-05-700-804-A. ALSO REMOVED AND REPLACED LANDING GEAR ELECTRONIC CONTROL UNIT IAW EMB MM 32-32-01-000-801-A. PERFORMED GEAR RETRACT IAW EMB MM 32-30-00-710-001 LANDING GEAR SYSTEM OPS CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE