As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CIRCUIT BREAKER P2 U3 "EMERGENCY LIGHTS" TRIPPED IN FLIGHT WITH ASSOCIATED "EMERGENCY LIGHTS ON" STATUS MESSAGE, ALL CABIN EMERGENCY LIGHTS WENT DARK AFTER 30 MINUTES LATER. RESET CIRCUIT BREAKER P2 U3 IAW FIM. NO FURTHER ACTION IS REQUIRED.