What was found
ELEC BACKUP SYS A FAILURE IN THE BACKUP ELECTRICAL SYSTEM HAS OCCURRED THAT CANNOT BE ATTRIBUTED TO A BACKUP GEN. SATUS MSG 01 LATCHED CRUISE MODE DEPENDENT, BACKUP GEN RT VOLTAGE IS LOW. BACKUP CONVERTER MSG 02 LATCHED CRUISE MODE DEPENDENT, BACKUP GEN LT VOLTAGE IS LOW. BACKUP CONVERTER MSG-2445490 LATCHED ER MODE MSG 445480 LATCHED ER MODE. PERFORMED BACKUP CONVERTER INSTALLATION TEST IAW AMM 24-25-09 CONFIRMING NORMAL OPERATION OF LT & RT BACKUP GENERATORS & CONVERTER WITH ENGS OPERATING. BACK UP GEN SYS SERVICEABLE.