What was found
BEFORE PUSHBACK W/L PACK OFF THE PACK OFF LIGHT WENT OUT AND THE L PACK OFF EICAS MESSAGE WAS NOT DISPLAYED. RTB, REMOVED AND REPLACED LT PACK VALVE. OPS NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BEFORE PUSHBACK W/L PACK OFF THE PACK OFF LIGHT WENT OUT AND THE L PACK OFF EICAS MESSAGE WAS NOT DISPLAYED. RTB, REMOVED AND REPLACED LT PACK VALVE. OPS NORMAL.