What was found
ELECTRICAL FAULT CYAN CAS: AFTER DEPARTURE CYAN CAS ELECTRICAL FAULT, WHITE CAS LEFT AND RIGHT BATTERIES OFFLINE AND LEFT AND RIGHT GENERATOR OFFLINE MEAASGES DISPLAYED. ELECTRICAL SYNOPTIC PAGE SHOWED BATTERIES AND GENERATORS WERE OFFLINE. THE CENTER CONSOLE SWITCHES SHOWED THAT BOTH GENERATORS AND BATTERIES WERE OFFLINE. THERE WAS NO INDICATIONS THAT POWER HAD BEEN LOST TO ANY SYSTEM. BATTERY TEMPS AND VOLTAGES WERE NORMAL AND GENERATOR LOADS WERE NORMAL. COMPLIED WITH THE UNEXPEXTED ELECTRICAL INDICATIONS CHECKLIST AND BROUGHT THE APU GENERATOR ONLINE. CAS MESSAGES CLEARED AND SYNOPTIC PAGE SHOWED ALL BUSES WERE POWERED. NO ASSOCIATED B3 CODES WERE NOTED ON THE MAINTENANCE FAULTS PAGES. REPLACED DCPC AND LH BATTERY CONTACTOR IAW CL-350 AMM 24-61-01. OPS CHECK SATISFACTORY.