As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ON PRE FLIGHT THAT THE EMERGENCY EXIT SIGN IN CABIN CEILING ONLY ILLUMINATING ON FWD FACE DURING TEST. AFT INOPERATIVE. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NR 4 AC/DC POWER INVERTER IAW EMB AMM 33-50-11, OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.