As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - DURING CLIMB, THE LEFT ENGINE BLEED CAUTION MESSAGE ILLUMINATED. FOLLOWING THE CHECKLIST THE MESSAGE DISAPPEARED. MAINTENANCE REPLACED THE LEFT PRESSURE REGULATOR SHUTOFF VALVE (PRSOV). OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.