As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2820 - CLIMBING OUT OF 10,00 FT, CABIN PRESS AND MASTER WARNING ILLUMINATED. THE APPROPRIATE CHECKS WERE RUN. MAINTENANCE INSPECTED THE AIRCRAFT AND THE PRESSURE CONTROL SYS. THE SYSTEM OPERATED NORMALLY. THE AIRCRAFT WAS RETURNED TO SERVICE. NO PARTS WERE REPLACED.