As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOG PAGE 8163386 FLT NR 14 PHX-JFK-EEL. ACFT EMERGENCY LIGHTS WERE ON 15-20 MINS DUE TO GROUND POWER FAILURE AT GATE. FLIGHT ATTENDANT REPORTED EMERGENCY LIGHTS WENT OUT. FLICKERED OFF BEFORE GATE POWER RESTORED. CHARGED STATE OF EMERGENCY LIGHTS NOW IN QUESTION. MX RESET CONNECTORS ON EMERGENCY LIGHT PACKS. BITE CHECK OF LIGHTS GOOD.