As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BWI - FLT 691 - CLIMBING OUT OF BWI, AT APPROXIMATELY 17,000 FEET, THE LEFT ENGIEN BLEED LIGHT ILLUMINATED. CABIN ALTITUDE BEGAN TO INCREASE. THE OXYGEN MASKS DEPLOYED, AND THE CREW PERFORMED A DESCENT. FLIGHT RETURNED TO BWI AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT ENGINE DEDICATED GENERATOR AND THE NR 2 PRESSURE CONTROLLER. (M)