As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ROLL AT 50 KNOTS W/S AIR O-HEAT ANNUNCIATOR LIGHT ILLUMINATED, PERFORMED ABORT. WHEN POWER WAS REDUCED LIGHT WENT OUT. REMOVED WINDSHIELD BLEED AIR CONTROL VALVES DUE TO "OVERHEAT" ON TAKE OFF. INSTALLED OVERHAULED VALVE IAW MM 30-41-00, OPS CHECKED AND LEAK CHECKED GOOD.