As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AIR INTERRUPT. EMERGENCY DECLARED. LANDING UNEVENTFUL. AIRCRAFT NOT OVERWEIGHT. DURING CRUISE, BATTERY SHOWED OFF ON UPPER EICAS WITH SWITCH IN ON. STATUS PAGE, RSCF POWER SUPPLY 1LSCF PWR SUPPLY 1, MAIN BATTERY SHOWS -1 AMPS DISCHARGE. MAINTENANCE ACCOMPLISHED FIM 24-33-00-810-807 FOR MAINTENANCE MESSAGE 24-13050. ALL OPERATIONS AND INDICATIONS NOW CHECK NORMAL.