As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT THE CABIN EMERGENCY LIGHTS ILLUMINATED WITHOUT BEING COMMANDED BY THE SWITCH POSITION. REMOVED FAULTY EMERGENCY BATTERY NR 1 FWD PN:6450LS-00 SN:002618 AND INSTALLED MODIFIED EMERGENCY BATTERY PN:650LS-00 SN:001127. REMOVED NR 2 AFT PN: 6450LS-00 SN:001130. PERFORMED OPERATIONAL CHECK OF EMERGENCY BATTERY AND LIGHTS. OPERATIONS CHECK GOOD. WORK DONE IAW EMB-505 AMM 33-52-01.