As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL BEFORE 80KTS, NOTED PACK TEMP EICAS MESSAGE. REJECTED TAKEOFF APPROXIMATELY 60 KTS. DEFERRED LEFT PACK PER 21-51-1ACCOMP FIM 21-51-00-815-803. FAULT FOUND MIX MAN SENSOR. R & R THE TS5296 SENSOR IAW AMM 21-51-08-004-001. OPS CHECKED OK.