As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STANDBY POWER OFF LT ILLUMINATED IN FLIGHT ALSO NOTICED BATT BUS CB TRIPPED BEHIND FO SEAT SECT 2. GROUNDED - YES. RESET BUS SECTION 2 C/B REF B737-800 AMM 20-60-01-801, C/B REMAINS SET. PERFORMED OPS TEST OF THE STANDBY POWER SYS PER AMM 24-34-00-710-802 NO DEFECTS NOTED.