As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTS ARE TURNING OFF AND ON UNCOMMANDED WHEN EMERGENCY LIGHT SWITCH IS IN ON POSITION. CABIN EMERGENCY LIGHTS ARE TURNING OFF AND ON UNCOMMANDED WHEN EMER LIGHT SWITCH IS IN ON POSITION: REMOVED #4 EMERGENCY LIGHT POWER SUPPLY P/N 8ES409800-00 S/N 6187748 AND INSTALLED REPAIRED CONDITION #4 EMERGENCY LIGHT POWER SUPPLY P/N 8ES409800-00 S/N 5690690 IAW GL5000 AMM 33-51-09. PERFORMED OPS AND FUNCTIONAL CHECKS IAW GL5000 AMM 33-51-09. OPS AND FUNCTIONAL CHECKS GOOD NO DEFECTS NOTED.