As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU UNIT EMERGENCY LIGHT L AND R TEST FAILED. REMOVED AND REPLACED LEFT AND RIGHT EPSU BATTERY UNITS. REF AMM 33-51-38. EMERGENCY POWER SUPPLY UNIT BITE CHECK NORMAL. REF AMM 33-51-00-710-001-A; CIDS BITE TEST NORMAL. REF AMM 23-73-00-740-005-A.