Left/right bank (aileron) and fore/aft tilt (elevator) are usually related to the swash plate. You should start out with a level swash plate, then fine tune it for any drifting. If you look at the swash plate from the rear with the sticks centered is the swash tilted to the right? If so, you need to level it by adjusting the left and right servo linkages. If the elevator is trimmed out ok try to adjust the linkages so that the fore/aft tilt of the swash plate doesn't change. After making swash adjustments check the collective pitch and tracking and make adjustments if necessary. Adjust the collective pitch by adjusting all 3 servo linkages the same amount to move the swash up or down without changing the tilt of the swash plate. Adjust the tracking by adjusting the linkages between the flybar and main rotors.