What was found
AT FL 360, IN THE CLEAR, F/O'S WINDSCREEN SHATTERED. HAD BRIGHT FLASH OUT OF LOWER RIGHT CORNER, SPARKING AND ARCING. ALSO HAD LOUD POPPING NOISE. TURNED OFF F/O WINDOW HEAT AND ARCING AND SPARKING STOPPED AFTER ABOUT ONE MINUTE. MADE EMERGENCY LANDING AT BUF. REMOVED AND REPLACED F/O'S WINDSCREEN PER M/M 56-11-11-4. ALSO, REPLACED F/O'S WINDSCREEN REGULATOR AND CONTROLLER, CKS GOOD PER M/M 30-42-00-5.