As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EVENT SUMMARY STATED PACK OVERPRESSURE ON TO RTG AND RECONFIGURED. CREW REPORT STATED STARTED TAKEOFF ROLL AND WE RECEIVED A LT PACK OVER PRESSURE CAUTION MSG. ABORTED THE TAKEOFF. CONTACTED MX CTRL AND WE DECIDED TO RESET PACK AND DEPART WITH BLEEDS ON THE APU. (RT PACK WAS DEFERRED). THE SUBSEQUENT TAKEOFF AND FLIGHT WAS WITHOUT INCIDENT.