As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE VISIT: MAINTENANCE REPORTS EMERGENCY POWER SUPPLY UNITS 12WL AND 14WL BATTERIES FAILED CIDS1-SYSTEM TEST 1-EPSU SYSTEM TEST IN REFERENCE WITH JOB CARD 26L00005062. REMOVED AND REPLACED 12WL & 14WL EMERGENCY POWER SUPPLY UNIT BATTERIES IAW AMM 33-51-38, OPERATIONAL TEST AND EPSU SYSTEM TEST PASSED. (SEE SDR # AALA201906249042)