As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELEC BACKUP SYS STATUS. DUE TO REPETITIVE REPORTS OF 'ELEC BACKUP SYS' STATUS MESSAGE WITH CORRELATED MESSAGE. IF NO FAULTS NOTED, REPLACE BUG CONVERTER (M24008) PCN 566-9012 & IF NECESSARY, CCB (K24202) PCN 566-0547. IAW MM REPLACED WITH NEW BUG CONVERTER & CCB (K24202). RAN BOTH ENG IAW JRH, OPS CK FINE AND INDICATION NORMAL. NO DEFECTS NOTED.