I moved your post as you are clearly talking about the FP2 and not FP1.
I don’t know anything about repair reports, but maybe we can help you with your issues.
To understand you correctly, how do I read the following sentence:
Is the “whenever I make a call” just about the loudspeaker issue or also about the black screen?
I’m asking because a blackscreen while doing something else is a very different issue then the screen not reactivating during phone calls.
In the second case removing the screen and cleaning the inside of the proximity sensor glass usually solves the issue. In the first case please take a look at this troubleshooting guide.