As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
" EMER LT BATT FAULT" STAUS MSG. REMOVED FROM SERVICE. INTERROGATED CMC AND FOUND F/C 33500004UT1. PERFORMED OPERATIONAL TEST OF RH OB EMERGANCY LIGHT POWER UNIT. TEST INDICATES BATTERY REQUIRES REPLACMENT.. REPLACED BATTERY PER AMM 33-50-01-000/400-802-A AND REPLACED ELPU PER AMM 33-50-01-000/400-801-A. AFTER BATT CHARGED FAULT NO LONGER PRESENT. A/C OK FOR CONTINUED SERVICE.