As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTING TEST FAILED, FAULTING EPSU BATTERY FWD L AND EPSU BATTERY AFT L PERFORMED EPSU OPS TEST FOR EPSU FWD L (10WL) AND AFT L (13WL), REF TSM 33-51-00-810-802-A. BATT FAULT RED LIGHT ON BOTH EPSUS. EPSU BATTERIES NIS AT ORD. ALLOWED EMERGENCY BATTERIES TO CHARGE WITH SWITTCH SET TO ARM. RETESTED EMERGENCY LIGHTS REF AMM 33-51-00, OPS CHECK GOOD.