As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5876, CLE TO LGA. DURING CLIMBOUT THE FLIGHT CREW NOTICED AN ELECTRICAL BURNING SMELL IN THE COCKPIT. NO VISIBLE SMOKE WAS REPORTED. THE AIRCRAFT RETURNED TO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RELAY K0234 (RIGHT LANDING LIGHT CONTACTOR) TO BE AT FAULT. THE RELAY WAS REPLACED AND THERE WERE NO FURTHER DEFECTS NOTED.