As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION INDICATION (ENGINE) - BLANK MSG01- ACTIVE ENGINE START HARD; SIGNAL CONDITIONER UNIT (LEFT) HAS NO OUTPUT ON SYSTEM ARINC 629 BUS (LEFT). DB- LEFT AIMS MSG-7708841 ACTIVE ES HARD. RESET CIRCUIT BREAKER PER FIM 77-31-825, NO HELP. RESET AIRCRAFT PWR NO HELP. REPLACED L VIB MONITOR UNIT AS PER REF MM. NO EXISTING MAINTENANCE MSG. REPLACED LT VIB MONITOR UNIT AS PER REF MM. NO EXISTING MAINTENANCE MSG.