How to write the letter about replacing the elevator rocker?

The letter of replacement of elevator rock plate for real estate development is as follows: according to the judge's website.

1. Title, subject matter and language type added by the writing organ.

2. Text. The text of the letter mainly includes two levels, which solves the two problems of "why to send the letter" and "the main content of the letter".

The main content of the letter is to replace the elevator rocker.

4, the end. The letter ends with "Hereby Letter".