As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, ABORTED TAKEOFF (LOW SPEED) DUE TO OUTFLOW VALVE NOT CLOSING AT TAKEOFF POWER. MAINTENANCE PERFORMED OPERATIONAL CHECK OF THE CABIN PRESSURE CONTROL IAW MM 21-32-03 AND 21-32-05. OPERATIONALLY CHECKED NORMAL, NO FAULTS FOUND. AIRCRAFT RETURNED TO SERVICE