Text: in 2009 we discovered that a lot was happening in the audio area but especially when it came to loudspeakers.

Correct capitalization: In 2009 we discovered that a lot was happening in the audio area but especially when it came to loudspeakers.

Text: the zombies are back and ready to be blown up again.

Correct capitalization: The zombies are back and ready to be blown up again.

Text: it is a 2-bedroom property with a double bed in each room.

Correct capitalization: It is a 2-bedroom property with a double bed in each room.

Text: this was a very high value for a residential house but it was used to borrow 13.2 billion yen from seven banks in 1989.

Correct capitalization:
This was a very high value for a residential house but it was used to borrow 13.2 billion Yen from seven banks in 1989.