As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING / AFTER EMERGENCY LIGHT TEST GOT "EMERG LT BAT 1 LO" ALERT. EMER LIGHTS - INOP. IDENTIFIED PARTS EMERG EXIT LIGHTS MPN: 60-4411-5 CPN: 3300197. PARTS(S) IDENTIFIED ARE THE MOST PROBABLE CAUSE. TROUBLESHOOTING IS REQUIRED PRIOR TO INSTALLING PART(S). NEW PWR SUPLY, EMERG EXIT LIGHTS INSTALLED AND TESTED IAW AMM 33-51-01-4-0 ALL GOOD.