What was found
DURING OPS CHECK USING MCDU CARD 0591-0115, STEP 2 EPSU 19WL FAILED , 19WL SELF TEST INOPERATIVE. REPLACED EPSU AND BATTERY POWER SUPPLY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING OPS CHECK USING MCDU CARD 0591-0115, STEP 2 EPSU 19WL FAILED , 19WL SELF TEST INOPERATIVE. REPLACED EPSU AND BATTERY POWER SUPPLY.