Did the blades (main or tail) touch the ground. Remove one and using an an hex driver, turn the bolt. If not turning straight, you might have bent a feathering shaft (try both font and back). Next will be the main shaft, but if it was only a hard landing and the blades didn't touch the ground, it might not be the case. Check that the tail shaft is straight. I agree with checking the servo operation and the arms that connect them to the swashplate are not bent.