As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. EMERGENCY EXIT LIGHTS ILLUMINATED OVER ALL DOORS EXITS AND OVER WINGS UPON POWER TRANSFER (STAY ON WHEN TURNED OFF). MAINTENANCE FOUND EMERGENCY POWER SUPPLY UNIT FORWARD L (10WL) AT FAULT. REPLACED 10WL POWER SUPPLY PER AMM 33-51-38.