As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER AIRCRAFT POWER DOWN, FOUND ROW 1 TO 3 EMERGENCY LIGHTS ARE ON. AIRCRAFT WAS GROUNDED. FURTHER TROUBLESHOOTING FOUND ROW 1-3 EMERGENCY LIGHT WILL NOT ILLUMINATE DURING TEST, ONLY COME ON WITH AIRCRAFT NOT POWERED. REPLACED AFT WIRELESS EMERGENCY LIGHTING CONTROL UNIT 17.