As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FOUND OVERHEAD DIRECTIONAL EXIT SIGN L1070 DOES NOT ILLUMINATE REPLACED POWER SUPPLY KNOWN GOOD POWER SUPPLY INSTALLED NO HELP. REF AMM 33-51-06. NEW POWER SUPPLY IN PLACE. REMOVED AND REPLACED EMERGENCY EXIT SIGN L1070 PER AMM 33-51-01.