As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORT - WAS FLYING ALONG STRAIGHT AND LEVEL AND SUDDENLY SMELLED A PLASTICKY ELECTRIC SMELL. STARTED TO TROUBLE SHOOT CIRCUIT BREAKERS AND INSTRUMENT PANEL FOR ANY OBVIOUS ISSUES AND FOUND #2 RADIO HAD SHORTED OUT. IMMEDIATELY TURNED BACK FOR BASE AND MONITORED REMAINING ELECTRONICS TO BE SURE NOTHING ELSE FAILED OR CAUGHT FIRE. LANDED SAFELY AT BASE AND INFORMED MAINTENANCE OF ISSUE.