As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING T/O ROLL, APROXIMATELY. 90 KIAS, ECAM INDICATED AFT AVIONICS DOOR OPEN. REJECTED TAKEOFF AND RETURNED TO GATE. REMOVED AND REPLACED AFT AVIONICS COMPARTMENT DOOR PROXIMITY SWITCH IAW AMM 52-71-14. OK FOR SERVICE.