Ambient Script CS0163

Hi, i am making a slender game but i got this error,

Assets/Slender 1/AmbientScript.cs(43,25): error CS0163: Control cannot fall through from one case label to another

here is the script

using UnityEngine;

public class AmbientScript : MonoBehaviour
{
	public int timer = 100;
	public Transform rotateme;
	public AudioClip fs1;
	public AudioClip fs2;
	public AudioClip fs3;
	public AudioClip fs4;
	public AudioClip fs5;
	public AudioClip fs6;
	public AudioClip fs7;
	public AudioClip fs8;
	public AudioClip fs9;
	public AudioClip fs10;
	public AudioClip fs11;
	public PlayerScript view;
	public AudioSource wind;
	public IntroScript intro;
	public LoseScript loser;
	
	private void Start()
	{
		this.rotateme.Rotate(new Vector3(0.0f, Random.value * 360f, 0.0f));
	}
	
	private void Update()
	{
		if (this.intro.gamestarted && this.loser.timeleft == 0 && (!this.view.mh || this.intro.timer >= 1600 && this.view.mh) || this.loser.timeleft > 250 && this.loser.timeleft < 900 && this.view.pages >= 8)
		{
			this.wind.volume = 1f;
			--this.timer;
			if (this.timer > 0)
				return;
			this.timer = (int) ((double) Random.value * 500.0) + 100;
			switch (this.intro.timer >= 1700 ? (int) ((double) Random.value * 9.0) + 1 : (int) ((double) Random.value * 8.0) + 1)
			{
			case 1:
			case 2:
				if (!this.view.lost && !this.view.daytime || this.view.lost && this.view.daytime)
				{
					AudioSource.PlayClipAtPoint(this.fs1, this.transform.position, 1f);
					break;
				}
				else
				{
					AudioSource.PlayClipAtPoint(this.fs8, this.transform.position, 1f);
					break;
				}
			case 3:
			case 4:
				if (!this.view.lost && !this.view.daytime || this.view.lost && this.view.daytime)
				{
					AudioSource.PlayClipAtPoint(this.fs2, this.transform.position, 1f);
					break;
				}
				else
				{
					AudioSource.PlayClipAtPoint(this.fs9, this.transform.position, 1f);
					break;
				}
			case 5:
			case 6:
				if (!this.view.lost && !this.view.daytime || this.view.lost && this.view.daytime)
				{
					AudioSource.PlayClipAtPoint(this.fs3, this.transform.position, 1f);
					break;
				}
				else
				{
					AudioSource.PlayClipAtPoint(this.fs10, this.transform.position, 1f);
					break;
				}
			case 7:
			case 8:
				if (!this.view.lost && !this.view.daytime || this.view.lost && this.view.daytime)
				{
					AudioSource.PlayClipAtPoint(this.fs4, this.transform.position, 1f);
					break;
				}
				else
				{
					AudioSource.PlayClipAtPoint(this.fs11, this.transform.position, 1f);
					break;
				}
			case 9:
				switch ((int) ((double) Random.value * 3.0) + 1)
				{
				case 1:
					AudioSource.PlayClipAtPoint(this.fs5, this.transform.position, 1f);
					break;
				case 2:
					AudioSource.PlayClipAtPoint(this.fs6, this.transform.position, 1f);
					break;
				case 3:
					AudioSource.PlayClipAtPoint(this.fs7, this.transform.position, 1f);
					break;
				}
			}
			this.rotateme.Rotate(new Vector3(0.0f, Random.value * 360f, 0.0f));
		}
		else
			this.wind.volume = 0.0f;
	}
}

Can someone help me please?

You need a break; at the end of case 9.
Also, move your breaks out of if/else parts of cases 2,4,6 and 8, like this:

case 1:
case 2:
  if (!this.view.lost && !this.view.daytime || this.view.lost && this.view.daytime)
  { AudioSource.PlayClipAtPoint(this.fs1, this.transform.position, 1f); }
  else
  { AudioSource.PlayClipAtPoint(this.fs8, this.transform.position, 1f); }
  break;
case 3: