As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AIRCRAFT NOT GROUNDED) DURING TEST OF EPSU, FAULT 10WL AND 11WL DISPLAYED. / REPLACED FWD 10WL AND MID LEFT 11WL EMERGENCY POWER SUPPLY BATTERIES IAW AMM 33-51-38-000-002-A AND 33-51-38-400-002-A. FAULT CLEARED, OPS CHECK OF EPSU SYSTEM GOOD PER 33-51-00-710-006-A."