As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXECUTED AN AIR TURN BACK DUE TO A BURNING ELECTRICAL ODOR AFTER TURNING ON THE WEATHER RADAR. CREW TURNED THE RADAR OFF AND PULLED ASSOCIATED CIRCUIT BREAKERS. MAINTENANCE REPLACED THE WEATHER RADAR TRANSCEIVER, WEATHER RADAR MODE PANEL AND LT & RT RECIRCULATION FILTERS.