Customer service tasks

Here are few tasks for a customer service engineer.
I even don't even have a single idea bout how it must look like!
Please help me to compile answers in English.
Thank you in advance!
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1. Inform customer about software update

Situation:
- A new Codec Build was just released. The customer is waiting for this update because it should contain fixes for bugs (video artifacts) found in the previous build. The New build is available on ftp://URL. *normally in English we talk about versions not builds
Support task:
- Write email notifications to Contacts about this update.

2. Check that the customer downloaded the Build

Situation:
- New Build was delivered to the customer (Task 1).
Support task:
- Write an email to the customer to check if they downloaded the new Build.

3. Repeat new Build email notification.

Situation:
- Contact says ftp URL doesn't work.
- Actually there was a problem with the ftp. It now works again.
Support task:
- Write an email to the contact in order to enable the customer to finally download the new Build.

4. Ask customer about the new Build testing results

Situation:
- The new Build was delivered to the customer 3 days ago. VV expects the customer has already completed tests with new Build.
Support task:
- Ask Contact about Build testing results.

5. Clarify details of Codec problems

Situation:
- Contact says that with the new Build, the old problems (video artifacts) still remain.
Support task:
- Ask customer appropriate questions and suggest steps to clarify reason the cause of the problems (just organizational steps).

Like I said, normally we call new editions of existing software versions in English, not builds, but since I am unfamiliar with the product, I did not correct that word. Well done!