As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONICS SYSTEM VENT FAILURE DURING TAKEOFF ROLL- CONTINUED TAKEOFF BUT UNABLE TO PRESSURIZE AIRCRAFT IN FLIGHT USING EITHER "AUTO OR MANUAL". OUTFLOW VALVE SHOWING FULL CLOSED, CABIN PRESSURE 1.0 TO 1.3 AT HIGHEST. REPEATED ALL STEPS OF THE MEL PROCEDURES, PERFORMED BITE TEST OF THE AEVC SYSTEM PER MEL 21-26-04A AND AMM 21-26-710-001-01.