【求助 請教一個英文問題？

因為國外廠商，附的說明書，並不詳細。所以打算寫封e-mail過去。
但有鑑於英文不好。懇求幫忙。
想要求對方，給於最新詳細的資料，保養及功能，校準手冊。

Dear Sir:
I am ~~~ at ~~~ (company) / We are ~~~, which purchased ~~~ .
(一些訂單編號跟日期, 好讓他確知是誰~~~)
We still have some questions regarding the maintenance and calibration of the ~~~
after reading the manual attached to the product.
Could you provide us with detailed information -- the update maintenance and calibration booklet(有專用的名稱就把這些換掉)for example.

Thank you in advance for your kind assistance.

Sincerely yours,

對商用書信沒經驗...可能有點暴笑.
不過希望能有些幫助:D