As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERG LIGHT: AT 43,000 ABOUT HOUR INTO FLIGHT CABIN EMERLIGHTING FLICKERING. LOOK AT VIDEO ATTACHMENT. REMOVED AND REPLACED #1 EMERGENCY BATTERY. REMOVED AD REPLACED #2 EMERGENCY BATTERY. PERFORMED SATISFACTORY OPS CHECK. WORK PERFORMED IAW AMM 33-52-01 AND FIM 33-50-00-810-802-A.