What was found
BAT/EPSU(13WL)AFT L MESSAGE DURING EPSU SYSTEM TEST / R+R EPSU BATTERY AT 13WL IAW AMM 33-51-38-400-002-A OPS CHECK GOOD"
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BAT/EPSU(13WL)AFT L MESSAGE DURING EPSU SYSTEM TEST / R+R EPSU BATTERY AT 13WL IAW AMM 33-51-38-400-002-A OPS CHECK GOOD"