As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OVERNIGHT INSPECTION, DISCOVERED THE RT CABIN AND OVER WING EMERGENCY LIGHTS INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE RT CABIN EPSU AND BATTERY IAW TASK CARD R1C33303. OPERATIONAL CHECKS WERE GOOD. DID NOT CONFIRM FAULT. UNIT WAS INSPECTED AND TESTED IAW CMM 33-51-12 REV 3.