What was found
WHILE ON DESCENT, FLIGHT CREW RECEIVED A GEN OFF R AMBER CAS MSG. THE APU WAS THEN STARTED TO BRING THE APU GEN ONLINE & WITHIN MOMENTS THERE WAS AN APU GEN OFF AMBER CAS MSG POSTED. DURING THIS TIME THE BATTERY CROSS TIE WAS CLOSED & SOON REOPENED DUE TO A 500 AMP DRAW ON THE LT SIDE. WITH DISTRACTIONS FROM THE ELEC MALFUNCTION THEY OVERSHOT THE FINAL & ELECTED TO GO AROUND WITH FLAPS AT 15 & GEAR UP. ON VECTORS BACK TO THE RUNWAY THEY RECEIVED A BATT 2 O’TEMP AMBER CAS MSG, SO BATTERY 2 WAS TURNED OFF IAW THE CHECKLIST. AN EMER WAS DECLARED AT THIS POINT. ALSO POSTED WAS AN AMBER DAU 2 FAIL, FOLLOWED BY DU’S 4 & 5, FMS 2, NR 2 RADIO & GEAR INDICATION, ALL ITEMS ON RT EMER BUS & RT MAIN BUS FAILED. WHEN SELECTED THE GEAR & FLAPS FAILED TO EXTEND, THE EMER GEAR EXTENSION WAS UTILIZED & GEAR DOWN WAS VERIFIED BY THE TOWER. AN UNEVENTFUL LANDING WAS ACCOMPLISHED. THE RT BATTERY WAS NOT BEING CHARGED BY THE GEN. TRANSORB PN S3106-5 & DIODES PN S3106-3 WERE REPLACED WITH NEW & FUNCTIONAL CHECKS WERE FOUND TO BE NORMAL. THE LG PNEUMATIC OVERRIDE VLV & EMER GEAR RELEASE HANDLE WERE RESET TO NORMAL POSITION. MULTIPLE GEAR SWING FUNCTIONAL CHECKS PERFORMED WITH NO DEFECTS NOTED.