As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT 8026 - AFTER TAKEOFF, THE NR 1 START VALVE 'OPEN' LIGHT ILLUMINATED. THE LIGHT EXTINGUISHED AFTER THE ENGINE POWER WAS REDUCED TO IDLE. THE FLIGHT RETURNED TO BWI AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE START VALVE PRESSURE SWITCH. (X)