As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO4349, CREW REPORTED "AIR RETURN--LANDING GEAR WOULD NOT RETRACT" MAINTENANCE TROUBLESHOT LANDING GEAR CONTROL SYSTEM AND FOUND INTERMITTENT LGEU FAILURE INDICATIONS IN CMC. CHECKED LANDING GEAR EXTENSION CIRCUIT AND PROXIMITY SWITCHES. NO DEFECTS NOTED. REMOVED AND REPLACED LGEU. SWUNG GEAR SEVERAL TIMES WITH NO DEFECTS NOTED. IAW EMB145 AMM. OPS. CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.