As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, EICAS CAUTION MESSAGE HS VALVE ILLUMINATED, NR 1 ENGINE N2 WAS ABOVE 80%. MESSAGE EXTINGUISHED AFTER REJECTED TAKEOFF AND THRUST LEVERS AT IDLE. GROUND RAN AIRCRAFT. PERFORMED HIGH STAGE VALVE FUNCTION TEST IAW MM 36-11-02-700-801-A/500. OPS CHECKED NORMAL. NO DEFECTS NOTED. OK FOR SERVICE.