What was found
STANDBY ATTITUDE INDICATOR: AFTER TAKEOFF NOTICED STBY ATTITUDE INDICATOR WAS IN A 3 DEGREE RIGHT TURN. WAS CONSISTANTLY ON THE 3 DEGREE RIGHT BANK FOR THE ENTIRE FLIGHT EXCEPT AT ONE POINT IT WENT 3 DEGREES LEFT. UPON LANDING ATTITUDE INDICATOR WENT BACK TO WINGS LEVEL. REMOVED FAULTY ELECTRONIC STANDBY INSTRUMENT SYSTEM -L3 AVIATION PRODUCTS MODEL GH-3900.2 IN ACCORDANCE WITH CESSNA MODEL 680A MAINTENANCE MANUAL 34-15-25 AND INSTALLED AN OVERHAULED GH-3900.2. PERFORMED SECONDARY FLIGHT DISPLAY OPERATIONAL CHECK AND CONFIGURATION MODULE (DCM) DATA RESTORATION IN ACCORDANCE WITH CESSNA MODEL 680A MAINTENANCE MANUAL 34-15-27 WITH NO DEFECTS NOTED.