Here are the steps to find and replace text or symbol with a carriage return in Excel 2003:

1. Open your Excel file and select the range of cells where you want to find and replace the text or symbol.
2. Press the Ctrl + H keys on your keyboard to open the Find and Replace dialog box.
3. In the Find what field, enter the text or symbol that you want to replace with a carriage return.
4. In the Replace with field, press the Alt + Enter keys on your keyboard to insert a carriage return.
5. Click on the Replace All button to replace all instances of the text or symbol with a carriage return.
6. Once the replacement is complete, click on the Close button to close the Find and Replace dialog box.

That's it! You have successfully replaced the text or symbol with a carriage return in Excel 2003.