What was found
RIGHT HPSOV EICAS MESSAGE LIGHT ILLUMINATED DURING FLIGHT. COMPLIED WITH QRH AND RETURNED TO DEPARTURE. EMERGENCY DECLARED, AIRCRAFT LANDED. THE AIRCRAFT WAS GROUNDED. REPLACED HIGH PRESSURE SHUT-OFF VALVE AND HIGH PRESSURE SHUT-OFF VALVE CONTROLLER AS A PRECAUTION IAW AMM 36-11-07 AND 36-11-08. HIGH POWER ENGINE RUN PERFORMED. ALL PARAMETERS FOUND TO BE NORMAL. NO MESSAGE NOTED AT THIS TIME. OK FOR SERVICE.