Thank you for the reply. The experience you have described is indeed very much like mine. In my case, it started with a series of strange behavior, like "Charging other device via USB" notification, not responsive "Smart Key", random launch of applications set to be opened with the smart key, and ended with the power button not working, fingerprint sensor issue, and most recently some pictures taken being only partially recorded. The customer service is not helpful at all. One representative tried to convince me that the decision of the liquid damage has been made based on the pictures of the phone that I have sent them. The other mentioned about a humidity sensor being active as the phone was opened (but it seems like they do not keep a record of that). Yet another logic offered was that the service center would rather repair the device than reject for any reason, because it is the only way for them to get paid. I do not know if it is true, but it is also possible that they are not able to keep up with repair requests, so that they choose to reject some. The fact that they introduce additional damage during the service is just so wrong.
At this point, I requested a written resolution on my ticket (which is pending since 7/10/2017), basically an official statement regarding Huawei Device USA position. It is something that the complaints department promised to deliver after the phone was returned from the repair, which was more than a month ago. Yesterday I spoke about this with a customer service supervisor, who ensured that the letter will be sent out by the end of the day, putting the ticket to bed. Not surprisingly, that was not the case, and yet again they are asking to wait additional 48-72 hours. I really have no idea what else can be done at this point. Hopefully the resolution letter may bring some ideas. I also think it would be great if we continue discussing this and, with the help of the community, we may get the things moving.