As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK TRIP & EICAS ON TAKEOFF ABORTED TAKEOFF AT 50 KTS. ACCOMPLISHED LT & RT PACK TEMP BITE PROC IAW FIM 21-51-00-101 FIG 103. NO FAULTS INDICATED. UNABLE TO DUPLICATE FAULT ON GND LHR. IAW FIM REPLACED LT PACK FLOW CONTROL VLV & ACCOMPLISHED INSTALLATION TEST IAW MM 21-51- 09. ALL OPERATIONS & INDICATIONS NOW NORMAL.