What was found
PILOT REPORTED - OVERHEAD PANEL OVERHEATING WITH A STRONG ELECTRICAL BURNING ODOR IN-FLIGHT. WINDSHIELD WIPERS CYCLED ONCE UNCOMMANDED. MAINTENANCE TROUBLESHOOTING - MAINTENANCE LOWERED OVERHEAD CONTROL PANEL TO TROUBLESHOOT, FOUND BALLAST RESISTOR HAD A LOOSE WIRE. RESECURED WIRE IAW BEECH MAINTENANCE MANUAL 30-40-00. OPERATIONAL CHECKS WERE GOOD. NO OTHER DEFECTS NOTED AND NO SIGNS OF OVERHEATING NOTED.