As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMER PWR ON IN FLT. PERFORMED QRH RESET EMER PWR REMAINED ON, DEPLOYED THE ADG PER QRH. 45 MIN LEFT IN FLIGHT. R/R EPCU IAW AMM 24-08-01. R-T-S TEST PASSED. IN CONCURRENCE WITH TECH SUPPORT AND AMC. REPLACED RELAY R2-5156 REF FIM 24-25-00-1. PERFORMED OPS CHECK OF EMERGENCY POWER SYSTEM REF MM 24-24-00-700-802. OPS CHECK GOOD. RAN ALL 3 MOTORS OPS CHECK ELECTRICAL SYSTEM GOOD. REF MM 24-24-00 . STOWED ADG 24-25-01-860-803