As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - EMERGENCY EXIT LIGHTS ILLUMINATE ABOUT EVERY 45 MINUTES, THEN SLOWLY FADE BACK TO OFF. MAINTENANCE FOUND FLOOR LIGHTS ON CONSTANTLY IN ARM. DISCONNECTED PLUG D4049F TO CHECK POWER. POWER CHECKED GOOD. WHEN RECONNECTED, PROBLEM DID NOT OCCUR. OPS CHECK NORMAL. (X)