Grid-based path-finding, similar to Legend of Grimrock/Eye of the Beholder...

I am working on an old-school grid-based first-person dungeon crawler and my prototype is almost complete. The only thing I have to work on is enemy path-finding. My enemy has a wander AI that is active when the FoundPlayer bool is false. He has a box collider that is stretched out really far in order to detect the player GameObject. As soon as I start scripting, I come to a halt. I am completely clueless how to lay this out.

Another thing you may spot is inefficient is the Random.Range to check when to move; however, I had to increase the value so as the enemy does not move as often. If you can suggest a more effective/efficient approach, I'm all ears :)

Here is my enemy movement script:

 using UnityEngine;
 using System.Collections;
 
 public class EnemyMovement : MonoBehaviour {
     
     public static bool CanMoveForward;
 
     public bool FoundPlayer;
 
     //Translation:
     float movSpeed = 4.0f;
     Vector3 pos;
     Transform tr ;
     public static bool moving = false;
     
     //Rotation:
     public static bool rotating = false;
     public float rotSpeed = 360f;
     float rotDegrees = 0f;
     Quaternion rotToAngle ;
     
     void Start () {  
         pos = transform.position;
         tr = transform;
 
         CanMoveForward = true;
 
         FoundPlayer = false;
     }
     
     // Update is called once per frame
     void Update () {
 
         int randomValue = Random.Range (1, 100);
 
         Debug.DrawRay(transform.position, transform.forward, Color.red);
 
         if (!moving && !rotating && !FoundPlayer) {
 
             if (randomValue == (1 | 2) && tr.position == pos && CanMoveForward) {
                 pos += transform.forward;
                 moving=true;
             }
 
             else if (randomValue == 5 && tr.position == pos) {
                 rotDegrees -= 90f;
                 rotToAngle = Quaternion.Euler(0, rotDegrees, 0);
                 rotating = true;
             }
 
             else if (randomValue == 6 && tr.position == pos) {
                 rotDegrees += 90f;
                 rotToAngle = Quaternion.Euler(0, rotDegrees, 0);
                 rotating = true;
             }
 
         } else if (FoundPlayer) {
 
         }
         
         
         
         //Translation:
         if (moving) {
             if (Vector3.Distance(transform.position,pos) <0.05f){
                 transform.position = pos;
                 moving=false;
                 //                print ("FINISHED MOVE");
             } else {
                 transform.position = Vector3.MoveTowards(transform.position, pos, Time.deltaTime * movSpeed);
             }
         }
         
         //Rotation:
         if (rotating) {
             if (Quaternion.Angle(transform.rotation,rotToAngle) <10f) {
                 transform.rotation = rotToAngle;
                 rotating=false;
                 //                print ("FINISHED TURN");
             } else {
                 transform.rotation = Quaternion.RotateTowards(transform.rotation, rotToAngle, rotSpeed * Time.deltaTime);
             }
         }
     }
     
 }
 

Thanks in advance!