What was found
ON APPROACH WITH LT AUTOPILOT ENGAGED. CLEARED ILS & ENGAGED APPROACH TILE. AUTOPILOT DISCONNECTED & CAPTAINS DISPLAY WENT BLANK. LOST STANDBY ATTITUDE INDICATOR. AFTER A FEW SECONDS CAPTAIN`S DISPLAY CAME BACK. TRIED TO RE -ENGAGE AUTOPILOT & APPROACH TILE WITH SAME RESULT. HAND FLEW ILS. ON GROUND HAD STDBY INVERTER ON STATUS PAGE & BATTERY TRANSFER/CONT CIRCUIT BRAKER OUT. R & R MAIN BATTERY RELAY K104, PERFORMED STANDBY POWER OPS TEST IAW AMM 24-33-00-6. TEST PASSED. ALL OTHER ITEMS STATED IN ORIGINAL WRI WENT BACK TO NORMAL OPS. AS A PRECAUTION, AN ENGINE RUN WAS CARRIED OUT TO CHK FOR PROPER POWER SWITCHING & BUSSES NORMAL OPS, ALL TESTS SATISFACTORILY CARRIED OUT. AIRCRAFT OK TO CONTINUE.