What was found
(CAN) DURING A ROUTINE FLIGHT, IT WAS NOTED DURING THE CLIMBOUT, THE PILOT ATTITUDE INDICATOR BECAME UNSERVICEABLE, THE FLIGHT AND LANDING CONTINUED WITHOUT COMPLICATIONS. AN AVIONICS SHOP WAS CONTRACTED VIA P/O TO R & R THE FAULTED GYRO WITH AN O/H UNIT, THE SYS WAS GROUND FUNCTION CHECKED SERVICEABLE.