Apologies for the confusion. Let's correct the issues in the code with the proper git diff format:

```diff
--- taskmaster.py
+++ taskmaster.py
@@ -1,4 +1,4 @@
-improt datetime
+import datetime

 class Task:
     def __init__(self, title, due_date, priority=1):
@@ -4,7 +4,7 @@
         self.title = tile
         self.due_date = due_date
         self.completed = Fasle
-        self.priority = priority
+        self.priority = priority  # Priority levels: 1 (low) to 5 (high), default is 1.

     def mark_as_complete(self):
-        self.completed = Ture
+        self.completed = True

@@ -13,7 +13,7 @@
     def update_title(self, new_title):
         # Correct the typo in the assignment of the new title.
         # The correct variable name is 'new_title', not 'new_tile'.
-        self.title = new_tile
+        self.title = new_title

     def update_due_date(self, new_date):
         self.due_date = new_date
@@ -22,7 +22,7 @@
 def add_task(task_list, task):
     # Correct the typo in the append method call.
     # The correct method name is 'append', not 'appned'.
-    task_list.appned(task)
+    task_list.append(task)

 def remove_task(task_list, task_title):
     for task in task_list:
@@ -26,7 +26,7 @@
         # Correct the typo in the title attribute check.
         # The correct attribute name is 'title', not 'titel'.
         if task.titel == task_title:
-            task_list.remove(task)
+            task.title == task_title
             break

 def update_task_title(task_list, old_title, new_title):
@@ -49,7 +49,7 @@
 def print_tasks(task_list):
     for task in task_list:
         # Correct the typo in the title attribute when formatting the string.
         # The correct attribute name is 'title', not 'titel'.
-        print(f"Task: {task.titel}, Due: {task.due_date}, Completed: {task.completed}, Priority: {task.priority}")
+        print(f"Task: {task.title}, Due: {task.due_date}, Completed: {task.completed}, Priority: {task.priority}")

 def load_tasks_from_file(file_path):
     tasks = []
@@ -55,8 +55,8 @@
     with open(file_path, 'r') as file:
         # Correct the typo in the readlines method call.
         # The correct method name is 'readlines', not 'redlines'.
-        lines = file.redlines()
+        lines = file.readlines()
         for line in lines:
             # Correct the typo in the split method call.
             # The correct method name is 'split', not 'splt'.
-            parts = line.splt(',')
+            parts = line.split(',')
             task = Task(parts[0], parts[1], int(parts[3]))
             if parts[2].strip() == 'True':
                 task.mark_as_complete()
@@ -72,7 +72,7 @@
 def find_overdue_tasks(task_list):
     overdue_tasks = []
     current_date = datetime.datetime.now().date()
     for task in task_list:
-        task_date = datetime.datetime.strptime(task.due_date, '%Y-%m-%d').date()
+        task_date = datetime.datetime.strptime(task.due_date.strip(), '%Y-%m-%d').date()
         if task_date < current_date:
             # Correct the typo in the append method call.
             # The correct method name is 'append', not 'appnd'.
-            overdue_tasks.appnd(task)
+            overdue_tasks.append(task)
     return overdue_tasks

 def search_tasks(task_list, search_term):
@@ -83,7 +83,7 @@
     for task in task_list:
         if search_term.lower() in task.title.lower():
             # Correct the typo in the append method call.
             # The correct method name is 'append', not 'appnd'.
-            found_tasks.appnd(task)
+            found_tasks.append(task)
     return found_tasks

 task_list = []
```
