As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TEST OF CABIN EMERGENCY LIGHTS THE FOLLOWING MESSAGE WAS DISPLAYED. EPSU UNIT FWD L. DURING THE TEST THE FWD HALF OF THE CABIN EMERGENCY LIGHTS DID NOT COME ON. REPLACED EPSU 10WL AND BATTERY REF AMM 33-51-38 UP TO AND INCLUDING STEP 4.C.