As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT, THE AFT FIVE ROWS OF EMERGENCY FLOOR LIGHTS AND EXIT SIGNS CAME ON ERRONEOUSLY. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY POWER SUPPLY AT 73WL. OPS CHECK GOOD. AIRCRAFT OK FOR SERVICE. (K)