As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON OPS CHECK OF EPSU PER WORK CARD 0591-0201 STEP 10 DOOR 4 LEFT 101WL4 BATTERY SUPPLY SHOWING FAULT ON DISPATCH PAGE WILL NOT CLEAR. REMOVED AND REPLACED DOOR 4 LEFT EMERGENCY POWER SUPPLY UNIT PER A350 AMM 33-51. FUNCTIONAL CHECK GOOD. MSG CLEARED. (LP# 6801257)