As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR-CREW REPORTED AFTER TAKEOFF, GEAR WOULD NOT RETRACT. NOSE GEAR DISAGREED WITH MAIN GEAR INDICATION AIRCRAFT LANDED WITHOUT INCIDENT. MX TROUBLESHOT A/C AND FOUND FAULTY LANDING GEAR ELECTRONIC UNIT REMOVED AND REPLACED LGEU GEAR SWUNG AND OPS. CHECKED SYSTEM GOOD IAW EMB 145 32-32-00. A/C RETURNED TO SERVICE.