What was found
DURING ESPU BATTERY CHECK. BATTERY AT POSTION 12WL SHOWING FAILED ON MCDU / REMOVED AND REPLACED ESPU BATTERY AT POSTION 12WL IAW AMM 33-51-38-00-002-A AND AMM 33-51-38-400-002. OPS CHECK GOOD."
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING ESPU BATTERY CHECK. BATTERY AT POSTION 12WL SHOWING FAILED ON MCDU / REMOVED AND REPLACED ESPU BATTERY AT POSTION 12WL IAW AMM 33-51-38-00-002-A AND AMM 33-51-38-400-002. OPS CHECK GOOD."